A search for a dolphin ultra fine filter can lead to several products that look closely related but are not interchangeable. Dolphin robotic pool cleaners use multiple filter families, and the correct choice depends on the exact cleaner, the replacement part family, and whether you need only the pleated media or an entire basket assembly. The difference between Nautilus CC and Nautilus CC Plus is a good example: their names are similar, yet their ultra-fine filtration parts belong to different families.
The products below fall into four main groups. Part 9991432-R4 is the larger panel family associated with cleaners such as Nautilus CC Plus and several M-line models. The S1 family uses 9991466-R4 replacement panels and 9991460-R1 complete baskets for compatible cleaners including Nautilus CC. Many S2-style robots use 9991467-R4 panels, while 9991458-R1 refers to a complete S2 ultra-fine basket. Matching the family first is more important than choosing between genuine and aftermarket products.
Ultra-fine filtration is most useful for smaller sediment that can slip through coarser media. Pleated panels provide a large surface area for this task, but the same dense structure means they need thorough rinsing. A filter that is packed with fine silt can reduce the open area available for water flow, so cleaning habits matter almost as much as the filter material itself.
Quick Comparison of Dolphin Ultra Fine Filter Options
- Genuine Maytronics 9991432-R4 part
- Four ultra-fine replacement panels
- Used in the Nautilus CC Plus/M-line filter family
- Genuine Maytronics 9991460-R1 basket assembly
- Full ultra-fine basket rather than loose panels
- S1-family fit including Nautilus CC
- Genuine S1 9991466-R4 panel set
- Four pleated ultra-fine panels
- Fits Nautilus CC and other listed S1 cleaners
- Genuine S2 9991467-R4 panel set
- Four ultra-fine pleated panels
- Listed for S200, Active 20/30, E30, M600 and related models
- Aftermarket 9991432-R4-style four-pack
- Listing explicitly says Nautilus CC Plus, not Nautilus CC
- Also lists M200/M400/M500 and Nautilus CC Supreme
- Aftermarket complete ultra-fine basket
- Listing includes Nautilus CC, S50/S100, E10/E20 and Active 10/15
- Basket format rather than loose filter panels
- Aftermarket 9991432-R4 panel set
- Four replacement cartridges/panels
- Listing targets M400/M500 and Nautilus CC Plus
- Aftermarket four-pack for the 9991432-R4 family
- Listing names Nautilus CC Plus and M200/M400/M500
- Panel/cartridge replacement rather than full basket
- Aftermarket S2-style 9991467-R4 panel set
- Listing names S200, DX4, Active 20/30, S300i and M600
- Pleated panel replacement, not a full basket
- Aftermarket 9991432-R4 four-pack
- Listing targets M400/M500 and Nautilus CC Plus
- Replacement panel set for an existing compatible frame
- Aftermarket full basket for the 9991458-R1 S2 family
- Listing names Active 20, E30, M600, DX4 and Triton PS
- Different format from 9991467-R4 loose panels
- Aftermarket full basket for the 9991460-R1 S1 family
- Listing includes Nautilus CC and numerous S1 models
- Complete assembly alternative to 9991466-R4 panels
- Aftermarket 9991432-R4 replacement family
- Eight panels provide two four-panel sets
- Listing names M200/M400/M500 and Nautilus CC Plus
What to Look for When Buying a Dolphin Ultra Fine Filter
Start With the Exact Filter Family
The safest buying process begins with the cleaner model and the replacement part family, not with a generic visual match. The four key references in this comparison are 9991432-R4, 9991460-R1, 9991466-R4, 9991467-R4, plus the S2 basket reference 9991458-R1. Two white pleated filters can look almost identical on a product page while differing in height, frame profile, retention tabs, or the way they lock into the basket.
For Nautilus owners, the model suffix is critical. Nautilus CC appears in the S1 compatibility group, while Nautilus CC Plus is associated with 9991432-R4. Buying a product that merely says “Nautilus” is therefore not enough. Read the full cleaner name from its label and compare it with the seller’s compatibility information or the manufacturer’s parts listing.
Decide Between Replacement Panels and a Complete Basket
Panel kits replace the pleated filtration surfaces while keeping the existing supporting assembly. They make sense when the basket or frame is straight, latches correctly, and has no cracks. Complete baskets replace more of the filtration assembly and can solve problems that new media cannot, such as a damaged frame or broken retention feature.
This difference is easy to see in the S1 group: 9991466-R4 is a four-panel set, while 9991460-R1 is a complete basket. In the S2 group, 9991467-R4 is the four-panel set and 9991458-R1 identifies a complete ultra-fine basket. Buying the larger assembly when only the media is worn may be unnecessary; buying only panels when the basket is broken leaves the actual problem unresolved.
Genuine Maytronics Parts Versus Aftermarket Replacements
Genuine Maytronics parts have the advantage of a manufacturer-defined part number, published compatibility information, and warranty details. The genuine 9991432-R4 and 9991467-R4 listings also include a manufacturer recommendation to replace the filter after roughly 200 operating hours. That does not mean every filter must be discarded at exactly the same moment, but it provides a useful service checkpoint.
Aftermarket filters can be practical when the product clearly identifies the replacement family and the exact cleaner is listed. The tradeoff is that dimensions, frame stiffness, pleat spacing, sealing surfaces, and long-term durability can vary by manufacturer. Inspect third-party parts before use and never force a panel or basket that does not seat naturally.
Pack Size and Spare Inventory
Most panel products in this guide contain four pieces, which corresponds to one complete replacement set for the compatible assembly. PUREBURG supplies eight panels, effectively two four-panel sets. Buying extra can be convenient for a cleaner that you plan to keep for several seasons, but spare quantity is useful only after fit has been confirmed. A first purchase is not the best time to stock a large supply of an uncertain part.
Fine Debris, Cleaning Frequency, and Flow
Ultra-fine pleated media is best treated as a precision filter rather than a leaf basket. Remove large leaves and bulky debris promptly, then use the finer media for the smaller material that remains. During dusty conditions or after a pool has collected a large amount of fine sediment, the pleats can load rapidly. A careful rinse after each heavy cycle helps keep the available filtration area open.
Avoid judging the need for replacement by color alone. White pleats can stain even when they remain functional. Look instead for tears, permanent deformation, cracked frames, damaged seals, pleats that remain blocked after cleaning, or a noticeable decline in filtration that does not recover after a thorough rinse.
Dolphin Genuine Replacement Part — Ultra-Fine Filter Panels (4PK) — 9991432-R4
This genuine Maytronics four-panel set is the reference point for the 9991432-R4 filter family. It is the most straightforward option in this group for owners who want the manufacturer-branded replacement rather than an aftermarket interpretation of the same part number. Maytronics identifies 9991432-R4 as a four-pack of ultra-fine debris filter panels and lists it among the replacement parts for cleaners including the Nautilus CC Plus and M400 family.
Design and Filter Format
The important word in this listing is panels. This is not a complete replacement basket or filter carrier. The package contains four pleated ultra-fine panels that replace the removable filtration surfaces used by the compatible filter assembly. If the plastic frame or carrier in the cleaner is still sound, replacing only the panels avoids buying more hardware than necessary.
Compatibility and Part Number
For this product, 9991432-R4 is more useful than a broad phrase such as “Dolphin ultra fine filter.” Dolphin has several robots with similar-looking filter systems, and their ultra-fine panels are not universal. The Nautilus CC Plus belongs to a different filter family from the smaller Nautilus CC, so owners should verify the cleaner label and the existing filter part before ordering.
Practical Use and Maintenance
Ultra-fine pleated media is intended for smaller debris that can pass through coarser filtration. That makes these panels useful after the pool has already been cleared of larger leaves and heavier debris, or when the remaining problem is fine dirt that keeps the water looking dusty. Fine pleats also need regular rinsing because a heavily loaded filter can restrict water movement through the cleaner.
Replacement Interval and Warranty
Maytronics recommends replacing this filter after about 200 hours of use and lists a one-year warranty for the genuine part. That recommendation is a useful inspection point rather than a reason to discard a clean, undamaged panel automatically. Torn pleats, cracked frames, persistent clogging, or filtration that no longer improves after thorough cleaning are stronger signs that replacement is due.
Who Should Consider It
This set makes the most sense for an owner whose cleaner is confirmed for the 9991432-R4 family and who prefers an OEM replacement with manufacturer-listed specifications. It is also a sensible baseline for comparing third-party 9991432-R4 sets: the aftermarket products may vary in pack size and construction, but they are all trying to replace this same functional panel family.
Who Should Consider Another Option
Do not choose it simply because the cleaner says Dolphin on the shell. Nautilus CC owners should look at the S1 parts such as 9991466-R4 panels or 9991460-R1 basket where compatible, while many S2-style cleaners use 9991467-R4 panels or a 9991458-R1-type basket. Buying by cleaner name plus exact part family is safer than buying by appearance.
Pros
- Genuine Maytronics 9991432-R4 replacement
- Four-panel set replaces the filtration media without requiring a full basket
- Manufacturer recommends a defined 200-hour replacement checkpoint
- One-year manufacturer warranty is listed for the genuine part
Cons
- Not a universal Dolphin filter; the cleaner must match the 9991432 family
- Panel set does not replace a damaged filter carrier or basket
- Four-pack quantity is smaller than some bulk aftermarket listings
Dolphin Genuine Replacement Part — Ultra-Fine Filter Basket — 9991460-R1
The genuine 9991460-R1 takes a different approach from the panel-only products in this guide. It is an ultra-fine filter basket assembly for the S1 family, and Maytronics lists the Nautilus CC among its compatible robots. That distinction matters because a complete basket is useful when the owner wants an assembled filtration unit rather than only replacement pleated panels.
Basket Assembly Versus Panel Set
A full basket can simplify replacement because the filtering surfaces and supporting basket are supplied as one assembly. It is particularly relevant if the existing basket has a damaged frame, warped plastic, broken latches, or another structural problem that a set of fresh panels would not solve. If the basket itself is healthy, however, replacing only the compatible panels can be the more component-efficient route.
S1 Compatibility
Maytronics lists this basket for a broad S1 group that includes Nautilus CC, Proteus DX3, S100, S50, E10, Active 10, Active 15, Explorer E20, Escape, Encore, Cayman and several related models. That does not make it suitable for every product carrying the Nautilus name. In particular, Nautilus CC Plus uses a different filter family, which is why the exact cleaner designation matters.
Handling and Cleaning
Basket-style filters are convenient to remove as a single unit. Once the basket is out of the cleaner, the pleated surfaces can be rinsed carefully so dirt is flushed out of the folds instead of being pushed deeper into them. Allowing accumulated fine sediment to harden in the pleats makes later cleaning more difficult and can reduce the useful filtration area.
Size and Replacement Considerations
Maytronics lists the packaged assembly at roughly 9.3 by 5.7 by 7.1 inches and about 1.764 pounds gross. Those are packaging specifications, not in-cleaner clearance measurements, but they reinforce that this is a complete basket assembly rather than four flat replacement panels. The part carries a one-year manufacturer warranty.
Who Should Consider It
This is a strong match for a confirmed S1-family cleaner when the entire ultra-fine basket needs to be replaced, or when the owner wants an OEM basket that can be swapped as a complete unit. It also gives buyers a clear manufacturer part number to use when checking any aftermarket basket that claims equivalent fit.
Who Should Consider Another Option
If the existing S1 basket is intact and only the ultra-fine media is worn, the genuine 9991466-R4 panel set can be the more targeted replacement. Owners of Nautilus CC Plus, M400/M500-style cleaners, or S2 models should not move to this basket merely because the term “ultra-fine” matches their search.
Pros
- Complete genuine S1 ultra-fine basket assembly
- Maytronics lists Nautilus CC and many related S1 cleaners as compatible
- Useful when the existing basket structure is damaged, not just the media
- One-year manufacturer warranty
Cons
- A full assembly can be unnecessary if only the removable panels need replacement
- Not the filter family used by Nautilus CC Plus
- Larger component than a simple four-panel replacement set
Dolphin Genuine Replacement Part — Ultra-Fine Filter Panels (4PK) — 9991466-R4
Part 9991466-R4 is the genuine four-panel ultra-fine replacement for the S1 filter family. It is especially relevant to Nautilus CC owners who still have a serviceable filter basket and need fresh pleated media rather than a complete 9991460-R1 basket assembly. Maytronics lists Nautilus CC, Proteus DX3, S100, S50, E10 and numerous related cleaners among the compatible robots.
Design and Build
The four pieces form the filtering surfaces used in the compatible S1 assembly. Replacing the panels lets the owner retain the existing basket structure, which is useful when the frame and latching points are in good condition. The genuine part is therefore different in scope from 9991460-R1 even though both belong to the same broad S1 filtration family.
Why the S1 Label Matters
S1 and S2 ultra-fine panels can look similar in product photos, but the part numbers and physical layouts are different. 9991466-R4 should be matched to an S1-compatible cleaner, while 9991467-R4 belongs to the S2 panel family. A visual match alone is not enough because small differences in panel geometry can prevent the filter from seating correctly.
Practical Filtration Role
These pleated panels are useful when the cleaning goal shifts from leaves and larger debris to finer sediment. The larger pleated surface area gives fine particles more media to encounter, but it also means dirt can lodge deeply in the folds. Rinsing each panel from several angles helps clear the valleys of the pleats instead of cleaning only the visible outer surface.
Package Information
Maytronics lists package dimensions of about 13.8 by 9.9 by 2.8 inches and a gross package weight of 0.871 pound. Those figures are not filter-cavity dimensions, so they should not be used to infer compatibility. The compatibility list and part number are the useful fit checks. Maytronics lists a one-year warranty for the genuine set.
Who Should Consider It
Choose this set when the robot is confirmed on the 9991466-R4 compatibility list and the existing basket structure is reusable. It is particularly logical for Nautilus CC owners who need ultra-fine media but do not need a second basket assembly occupying storage space.
Who Should Consider Another Option
If the basket frame is cracked or its retention points are damaged, replacing only the panels does not repair the underlying assembly. In that situation, a compatible 9991460-R1 basket is the more complete fix. Nautilus CC Plus owners should move to the 9991432-R4 family instead.
Pros
- Genuine four-panel S1 replacement
- Confirmed by Maytronics for Nautilus CC and many related cleaners
- Reuses an intact basket rather than replacing the complete assembly
- One-year manufacturer warranty
Cons
- Requires an existing compatible S1 basket/frame in usable condition
- Easy to confuse with the visually similar S2 9991467-R4 family
- Not intended for Nautilus CC Plus
Dolphin Genuine Replacement Part — Ultra-Fine Filter Panels (4PK) — 9991467-R4
The genuine 9991467-R4 set is the S2 counterpart to the S1 9991466-R4 panels. Maytronics lists a wide group of S2-style robots for this four-panel set, including S200, Active 20, Proteus DX4, Triton PS, S300, Active 30, Explorer E30, S300i and M600 variants. It is therefore a key reference part for buyers whose cleaner sits in this family rather than the Nautilus CC or Nautilus CC Plus groups.
Panel Format and Fit
This is a four-panel media replacement, not a complete filter basket. It depends on the cleaner already having the compatible supporting assembly. A panel that is even slightly wrong in height, edge shape, or retention geometry can be difficult to seat, so the exact 9991467-R4 family should be confirmed before purchase rather than inferred from the color or pleat pattern.
Cleaning Fine Debris
Ultra-fine media becomes most useful after the cleaner has handled larger debris and the pool still shows a light layer of silt or fine particulate. Because the media is denser than a coarse screen, it benefits from frequent rinsing. Cleaning before sediment dries into the folds is easier and helps maintain open filtration area.
Manufacturer Specifications
Maytronics lists the package at 430 by 60 by 250 millimeters with a gross weight of 0.3 kilogram. It recommends filter replacement after about 200 operating hours and lists a one-year warranty. The operating-hour recommendation is best paired with inspection: physical damage or permanently clogged pleats can justify replacement sooner.
Compatibility Breadth
The official compatibility list is broad, but breadth should not be mistaken for universality. It is broad within the S2 family. The smaller S1 cleaners and M-line/CC Plus models use different filter part numbers. This is one of the most common traps in a general search for a Dolphin ultra fine filter.
Who Should Consider It
This set suits owners who have an S2-family cleaner explicitly associated with 9991467-R4 and want the manufacturer-branded replacement panels. It is also the useful OEM benchmark for comparing the third-party 9991467-R4 four-pack later in this guide.
Who Should Consider Another Option
If the cleaner requires a complete S2 basket rather than replacement panels, a 9991458-R1-type basket is a different purchase. If the robot is Nautilus CC or Nautilus CC Plus, check the S1 or 9991432 families instead of assuming the S2 panel set will fit.
Pros
- Genuine Maytronics S2 four-panel set
- Broad official S2 compatibility list
- Manufacturer gives a 200-hour replacement guideline
- One-year manufacturer warranty
Cons
- Does not include the complete S2 filter basket
- Not interchangeable with S1 9991466-R4 panels
- Not the correct family for Nautilus CC Plus
SUNRRA Ultra Fine Filters Compatible with Dolphin Nautilus CC Plus (Not for Nautilus CC), Nautilus CC Supreme, M200/M400/M500, Part # 9991432-R4, Pleated Pool Cleaner Replacement Part, 4 Packs
SUNRRA’s four-pack is an aftermarket option built around the 9991432-R4 replacement family. Its title contains one of the most useful compatibility warnings in this entire group: Nautilus CC Plus is listed, while Nautilus CC is explicitly excluded. That single distinction can prevent a common ordering mistake because the two cleaner names sound closely related but use different filtration families.
What the Listing Is Replacing
This is a panel set, so it is intended to replace the pleated filtration elements rather than the complete filter carrier. The listing identifies 9991432-R4 and names Nautilus CC Plus, Nautilus CC Supreme, M200, M400 and M500 among its target cleaners. Buyers should still compare the existing panel shape and part reference before installation because aftermarket compatibility is a seller claim rather than a Maytronics OEM certification.
Why the “Not for Nautilus CC” Warning Matters
The original Nautilus CC belongs to the S1 filter family, where 9991466-R4 panels and 9991460-R1 baskets are relevant. Nautilus CC Plus is associated with 9991432-R4. A buyer who searches only “Nautilus filter” can easily land on the wrong component, so SUNRRA’s explicit exclusion is useful information rather than a minor footnote.
Aftermarket Considerations
The main purchase question is not whether this looks like an ultra-fine panel; it is whether the dimensions, edge profile, and seating geometry match the cleaner’s filter assembly. Keep the packaging until fit is confirmed, inspect all four panels for shipping distortion, and do not force a panel into a frame that does not accept it naturally.
Who Should Consider It
This product is worth considering for a confirmed 9991432-R4-family cleaner when an aftermarket four-pack is acceptable and the buyer values the listing’s clear model guidance. It is particularly easy to understand for Nautilus CC Plus owners because the title addresses the CC-versus-CC-Plus distinction directly.
Who Should Consider Another Option
Owners who want a manufacturer-branded part can choose the genuine 9991432-R4 set. Nautilus CC owners should not use this listing; they should check the S1 products instead. If the filter carrier itself is damaged, a panel-only purchase will not solve the structural problem.
Pros
- Clear 9991432-R4 replacement positioning
- Title explicitly distinguishes Nautilus CC Plus from Nautilus CC
- Four-panel format matches the usual panel replacement quantity
- Lists several M-line cleaners as target models
Cons
- Aftermarket fit claims are not the same as Maytronics OEM certification
- Not suitable for the Nautilus CC according to the listing
- Does not replace a damaged filter carrier
Ulticor Ultra Fine Filter Basket Compatible with Dolphin Robotic Pool Cleaners S50 S100 Active 10 & 15 Echo T15 T25 Proteus DX3 Saturn Cayman Escape Nautilus CC Encore E10 Explorer E20 Solo Advantage
Ulticor’s product is a complete aftermarket ultra-fine filter basket aimed at many of the same S1-style cleaners that Maytronics lists for its genuine S1 filtration parts. The title includes Nautilus CC, S50, S100, Active 10 and 15, E10, Explorer E20, Proteus DX3, Cayman, Escape and Encore. Its practical advantage over a loose panel set is that the filtration media arrives integrated with a basket-style assembly.
Complete-Basket Convenience
A full basket is useful if the original basket has cracked plastic, damaged clips, a distorted frame, or simply needs to be replaced as a unit. It can also be convenient for owners who like to keep a second filter assembly ready: one basket can be rinsed and dried while the other is installed. That use case is different from buying four replacement panels for an existing frame.
Compatibility Check
The models named in the listing strongly resemble the S1 compatibility group, but buyers should still verify the exact cleaner and the shape of the installed basket. Aftermarket listings can group several related robots under one product, and model names sometimes vary by sales channel. The most reliable practical check is agreement among the cleaner model, the existing assembly style, and the seller’s compatibility information.
Fine-Debris Cleaning
Basket media with dense pleats is intended for finer particles than a coarse debris screen. It works best when the basket is not allowed to become heavily packed. Rinse the pleats thoroughly, inspect the corners where debris can collect, and make sure the basket closes and seats without forcing it back into the cleaner.
Who Should Consider It
This product fits the buyer who wants a complete aftermarket basket for one of the specifically listed S1-style cleaners and prefers a single drop-in assembly over changing individual panels. It can also make sense as a secondary fine-debris basket kept separate from a coarser filter setup.
Who Should Consider Another Option
If only the media is worn and the existing S1 basket is intact, a 9991466-R4-style panel set is the more targeted purchase. Nautilus CC Plus owners should not assume this basket fits simply because “Nautilus” appears in the title; CC Plus belongs to the 9991432-R4 family.
Pros
- Complete basket format can replace a damaged or tired filter assembly
- Listing covers many common S1-style Dolphin cleaners
- Can be kept as a ready-to-swap spare basket
- Avoids transferring individual panels into an old frame
Cons
- Bulkier and potentially unnecessary when only filter media needs replacement
- Compatibility is based on the aftermarket listing rather than an OEM part certification
- Nautilus CC Plus is not the same fit family as the listed Nautilus CC
Fil-fresh Robotic Pool Cleaner Filters, Replaces for Dolphin M400/M500 & Nautilus CC Plus Ultra Fine Cartridge Filter Panels, Part Number 9991432-R4, Pack of 4
Fil-fresh offers another four-piece aftermarket route for the 9991432-R4 family. The listing specifically names Dolphin M400, M500 and Nautilus CC Plus, making it relevant to buyers who have already established that their cleaner uses this larger panel family. It should not be confused with the S1 panels used by the smaller Nautilus CC.
Format and Intended Fit
The pack contains four pleated replacement filter panels. That means the existing filter support structure remains part of the system, and its condition matters. Before ordering, inspect the current panels and frame together; if the frame is cracked or does not latch correctly, new media alone will not restore the assembly.
Using Part Number 9991432-R4 as the Anchor
Cleaner model names are useful, but the replacement part number is the stronger cross-check because several Dolphin cleaners share families while other similarly named models do not. A buyer with a Nautilus CC Plus should see 9991432-R4 as the relevant family reference. A buyer with Nautilus CC should stop and look at the S1 options instead.
Aftermarket Fit and Inspection
With any third-party panel set, inspect all four pieces before installation. Consistent edge molding, straight frames, and undamaged pleats matter because the panels must seal against their holder. If one panel sits proud of the frame or needs excessive pressure to lock in place, recheck compatibility rather than forcing it.
Who Should Consider It
This set is for buyers comfortable with an aftermarket replacement who have an M400/M500 or Nautilus CC Plus that matches the seller’s 9991432-R4 claim. The four-pack format mirrors the normal complete set of filtration panels, so one purchase is intended to refresh the full set rather than only one side.
Who Should Consider Another Option
The genuine Maytronics 9991432-R4 set is the clearer choice for owners who prioritize OEM sourcing and manufacturer warranty terms. Buyers who expect to change filters repeatedly may also compare the eight-panel PUREBURG pack, which offers two four-panel sets in one package.
Pros
- Four-panel 9991432-R4-style replacement set
- Listing directly names Nautilus CC Plus and M400/M500
- Lets an intact filter frame remain in service
- Straightforward option for replacing a complete set of four panels
Cons
- Aftermarket dimensional consistency should be checked before use
- Not intended for the smaller Nautilus CC filter family
- No complete basket/frame is included
M400 Ultra Fine Cartridge Filter Replacement for Dolphin Nautilus CC Plus | 4 Pack Cartridge Filter Compatible With Dolphin M200 M400 M500 Robotic Pool Cleaner Parts, Replaces Part # 9991432-R4
This four-pack is positioned directly as a 9991432-R4 replacement for Dolphin M200, M400, M500 and Nautilus CC Plus cleaners. Its role is therefore similar to the SUNRRA and Fil-fresh sets: refresh the pleated ultra-fine media while retaining the existing filter structure. The main decision point is verified fit, not the generic “M400” wording at the beginning of the title.
What You Are Replacing
The package is a set of four cartridge-style filter panels. If the cleaner’s current frame is intact, a panel replacement can restore fresh media without replacing the larger assembly. Before removing the old set, note how each panel sits in the holder so the new pieces are installed in the same orientation and fully seated.
Model Names and Cross-Checking
M200, M400 and M500 are all named in the listing, as is Nautilus CC Plus. That is a useful starting point, but owners should still cross-check the filter already in the robot. Product lines can have revisions, and online model names are sometimes shortened. The part family 9991432-R4 should match the cleaner’s documented replacement filter family.
Who Should Consider It
This product is an option for a confirmed 9991432-R4-family cleaner when the buyer wants a third-party four-pack and does not need a basket. It is particularly relevant to shoppers comparing several similarly priced aftermarket sets where the product titles name the same group of M-line cleaners.
Who Should Consider Another Option
If the cleaner is Nautilus CC rather than CC Plus, this is the wrong filter family. If OEM sourcing matters more than aftermarket choice, use the genuine 9991432-R4. If the buyer wants a larger reserve of replacement panels, the PUREBURG eight-pack changes the quantity equation.
Pros
- Four panels cover a full 9991432-R4-style replacement set
- Listing includes Nautilus CC Plus plus M200/M400/M500
- Uses the established 9991432-R4 reference number
- Keeps an undamaged filter frame in service
Cons
- Third-party fit should be verified against the exact cleaner and old panels
- Panel set cannot repair a damaged carrier
- Not compatible merely because a cleaner has “Nautilus” in its name
Replace Part#9991467-R4 Ultra-Fine Filter Panels Compatible with Dolphin Robotic Pool Cleaners,Pleated Cartridge Filter Replacement for Dolphin S200,Proteus DX4,Active 20,Active 30,S300i,M600
This aftermarket four-panel set targets the 9991467-R4 S2 filter family. Its listing names S200, Proteus DX4, Active 20, Active 30, S300i and M600, all models that sit within the broader S2-style compatibility group associated with the genuine 9991467-R4 panels. That makes it a direct third-party alternative to the genuine S2 panel set rather than an alternative to the S1 or 9991432 products.
S2 Family Fit
The strongest purchasing signal is the 9991467-R4 reference combined with the named S2 models. Buyers should still confirm the exact robot because the Dolphin range contains several generations that use different filters. A set that looks right in a photo can still have different edge geometry or retention points.
Panel Replacement Versus Basket Replacement
These are pleated panels only. If the S2 basket or carrier is cracked, warped, or has broken locking features, buying panel media will not replace those structural pieces. In that situation, a 9991458-R1-style complete basket, such as the Gearwiz product in this guide, is the more relevant format to investigate.
Use With Fine Sediment
Dense pleated media is useful after the cleaner has already removed leaves and larger material but fine sediment remains. The filter can become visibly brown or dusty after a single heavy cycle in some pools. That does not automatically mean the filter is worn out; thorough rinsing may restore it if the pleats and frame are physically intact.
Installation Check
Install all four panels squarely and confirm that each one is captured by the holder before returning the filter assembly to the robot. A panel that is bowed or not fully seated can create a bypass path around the media. Do not compensate for a mismatch by trimming plastic or forcing a latch closed.
Who Should Consider It
This set is aimed at owners of specifically listed S2-family robots who want an aftermarket 9991467-R4 panel replacement and already have a serviceable basket. It is especially easy to compare against the genuine product because both use the same replacement-family reference and four-panel format.
Who Should Consider Another Option
Choose the genuine Maytronics 9991467-R4 set if OEM sourcing and its listed one-year warranty matter. Choose a full S2 basket if the holder is damaged. Owners of Nautilus CC or Nautilus CC Plus should use their respective S1 or 9991432 families instead.
Pros
- Direct 9991467-R4-style aftermarket replacement
- Listing names several common S2-family cleaners
- Four-panel format refreshes the complete pleated set
- Useful alternative when the existing S2 basket is still sound
Cons
- Not a complete basket assembly
- Aftermarket fit should be confirmed before forcing any panel into place
- Different family from both Nautilus CC and Nautilus CC Plus filters
TUOWS for Dolphin Filters 9991432-R4 4 Packs Replacement Pool Filter Compatible with Dolphin M400/M500, Nautilus CC Plus Robotic Pool Cleaner
TUOWS is another four-pack aimed at the 9991432-R4 family, with M400, M500 and Nautilus CC Plus called out in the listing. Its place in this comparison is less about a unique filtration concept and more about offering another aftermarket source for the same panel family. The buyer still needs to confirm that the cleaner belongs to 9991432-R4 rather than choosing by the general “Dolphin filters” wording.
Part-Family Match
For a Nautilus CC Plus owner, the 9991432-R4 reference is the useful compatibility anchor. For a Nautilus CC owner, it is a warning to stop: the smaller CC uses an S1 arrangement instead. This is why the similar model names should never substitute for checking the actual replacement family.
Four-Panel Replacement
The package quantity is four, which corresponds to a complete set of pleated panels for the compatible assembly. Replacing all four at once keeps the media age and condition consistent around the filter. If only one panel is damaged, keeping the remaining new pieces clean and stored flat can preserve them for later use.
Filter Care
Fine pleats collect material that is easy to miss during a quick rinse. Rotate each panel while rinsing and check the channels between pleats for retained silt. Do not reinstall panels with debris trapped on the sealing edges, because a panel that cannot sit flat may allow water to take the easier path around the media.
Who Should Consider It
TUOWS is relevant to a buyer who has confirmed a 9991432-R4-compatible cleaner and is comparing third-party four-packs rather than complete baskets. It is a straightforward quantity for one full replacement cycle, without the extra inventory of an eight-panel pack.
Who Should Consider Another Option
Buyers who want OEM branding and Maytronics’ own warranty terms should use the genuine 9991432-R4. Those who prefer to stock two full replacement sets may find the eight-panel PUREBURG option more convenient. Owners of an S1 or S2 cleaner should choose the corresponding family instead.
Pros
- Uses the 9991432-R4 replacement reference
- Four panels make one complete replacement set
- Listing directly names Nautilus CC Plus and M400/M500
- No need to replace an intact filter carrier
Cons
- Aftermarket fit and frame quality should be checked on arrival
- One four-pack provides less spare inventory than an eight-pack
- Not the correct family for Nautilus CC or S2 robots
Gearwiz Ultra Fine Filter Basket Compatible with Dolphin Robotic Pool Cleaners, Active 20, Explorer E30, M600, Proteus DX4, Triton PS and Many More Models, See Bullet Points, Part Number 9991458-R1
Gearwiz changes both the part number and the physical format. It is a complete aftermarket ultra-fine basket listed around part 9991458-R1, with Active 20, Explorer E30, M600, Proteus DX4 and Triton PS among the named compatible cleaners. Those models overlap the S2 world of 9991467-R4 panels, but the purchase is not the same: 9991458-R1 refers to a full basket assembly rather than a four-panel replacement set.
Why 9991458-R1 Is Different
A buyer can own an S2 cleaner and still have two legitimate shopping paths depending on what needs replacing. If the basket assembly is healthy, 9991467-R4 panels may be enough. If the frame, basket, or integrated filter structure needs replacement, a 9991458-R1-style basket is the more complete component. Matching the failure to the part prevents unnecessary replacement.
Compatibility
The listing names several established S2-family cleaners. Maytronics also identifies 9991458-R1 as an ultra-fine debris filter basket for S2-style products. Even with that family alignment, the exact robot should be checked because a long compatibility list can contain channel-specific model names and revisions.
Swapping Complete Baskets
A complete basket is convenient for fast changes between filtration setups. An owner can keep one basket ready for fine debris and another for a different cleaning task, provided both are actually compatible with the robot. The tradeoff is more storage space and a higher amount of hardware being replaced compared with a panel-only kit.
Cleaning and Inspection
Rinse the basket so water moves through the pleats and carries dirt outward. Inspect hinge points, latches, and the top edge as well as the media itself. With a complete aftermarket basket, smooth mechanical engagement is just as important as the filter fabric because the assembly must sit correctly in the robot.
Who Should Consider It
This product is for a buyer with one of the listed S2-type cleaners who wants a full replacement basket rather than loose panels. It is especially relevant when the old basket is structurally tired, when keeping a second assembled basket is convenient, or when the owner does not want to transfer filter elements between frames.
Who Should Consider Another Option
If the existing S2 basket is structurally sound and only the pleated media needs renewal, 9991467-R4 panels are the more focused replacement. Owners of S1 cleaners such as Nautilus CC should look to 9991460-R1 or 9991466-R4; Nautilus CC Plus owners should look to 9991432-R4 products.
Pros
- Full S2-style basket instead of loose panels
- Uses the distinct 9991458-R1 basket-family reference
- Listing names several common S2 cleaners
- Can serve as a complete swap-in assembly when the old basket is damaged
Cons
- More hardware than needed if only the filter panels are worn
- Bulkier to store than a spare panel set
- Aftermarket basket fit and latch engagement should be verified carefully
Ultra-Fine Filter Basket Part 9991460-r1 Compatible with Dolphin Cleaners | Compatible with Dolphin S50,S100,Active10&15,Echo,Nautilus CC,Encore,E10,E20,T15,Proteus DX3,Solo,Cayman,Advantage,Maytronics
This aftermarket basket is explicitly positioned as a 9991460-R1-compatible replacement for S1-style cleaners such as Nautilus CC, S50, S100, Active 10 and 15, E10, E20 and Proteus DX3. Its closest genuine counterpart in this guide is the Maytronics 9991460-R1 basket, while the genuine 9991466-R4 product is the panel-only route for the same broad S1 family.
Full Basket Replacement
The main reason to choose this format is structural replacement. A complete basket can address more than worn pleats: it replaces the supporting assembly as well. If the old basket has damaged plastic or no longer locks correctly, a new set of panels cannot fix those problems. The basket format therefore has a distinct role even when both products are described as ultra-fine.
Model-Family Check
The listing’s compatibility list follows the S1 pattern and specifically includes Nautilus CC. That is helpful because it separates this product from 9991432-R4 choices for Nautilus CC Plus. Owners should still confirm the exact model label and compare the old basket shape before committing to an aftermarket assembly.
Care and Seating
After rinsing, check that no grit remains on edges that contact the cleaner. Fine sediment around latching or seating surfaces can make an otherwise compatible basket feel tight. If the new basket does not lower into place with normal alignment, remove it and recheck the orientation rather than using force.
Who Should Consider It
This basket is aimed at S1-family owners who accept an aftermarket assembly and either need to replace the existing basket or want a ready-to-use spare. It is especially relevant to Nautilus CC owners who have confirmed 9991460-R1 as the appropriate basket family.
Who Should Consider Another Option
If only the filter media needs replacement, 9991466-R4-style panels keep the existing basket in service. If OEM sourcing is important, choose the genuine 9991460-R1. Nautilus CC Plus users should not substitute this basket for the separate 9991432-R4 filter family.
Pros
- Complete 9991460-R1-style S1 basket
- Listing specifically includes Nautilus CC and multiple related cleaners
- Can replace both media and supporting basket at once
- Useful as a preassembled spare for compatible robots
Cons
- May be unnecessary if the original basket is structurally sound
- Aftermarket basket tolerances should be checked before use
- Not the Nautilus CC Plus/9991432 filter family
PUREBURG Ultra-Fine Filter Panels Compatible with Dolphin M200 M400 M500 and Nautilus CC Plus Robotic Pool Cleaner, Replaces Part 9991432-R4, Pack of 8
PUREBURG is the quantity outlier in this comparison. Instead of four panels, the listing supplies eight 9991432-R4-compatible ultra-fine panels for M200, M400, M500 and Nautilus CC Plus cleaners. Because a typical complete refresh uses four panels, an eight-pack effectively provides two sets, which changes the storage and replacement-planning question even though the basic filter family is the same.
Why the Eight-Pack Matters
Extra quantity is useful only if the fit is correct and the buyer expects to use the second set. For a household that keeps a cleaner for several seasons, two full sets can reduce the need to reorder later. For someone replacing filters for the first time or uncertain about compatibility, a smaller four-pack may be the more cautious way to confirm fit before stocking spares.
9991432-R4 Family
The listing names the same core group seen across other 9991432-R4 aftermarket products: Nautilus CC Plus and M200/M400/M500. The warning about similar names still applies. Nautilus CC is a separate S1 family and should not be treated as compatible because “Nautilus” appears in both product lines.
Storing Spare Panels
Unused pleated panels should be stored where they remain flat, clean, and protected from crushing. Keeping the second set in its packaging can prevent the pleats from collecting workshop dust or being bent by heavier items on a shelf. Bulk value disappears quickly if spare panels are damaged before they are installed.
Cleaning Versus Replacing
An eight-pack can make replacement feel easy, but filters should not be discarded merely because they look dirty after a fine-debris cycle. Rinse thoroughly and inspect the pleats. Replacement is more justified when the media is torn, the frame is damaged, the pleats stay obstructed after cleaning, or filtration performance does not recover.
Who Should Consider It
This product is suited to a confirmed 9991432-R4-family owner who prefers an aftermarket option and wants two full sets on hand. It can be convenient for heavy seasonal use, multi-season planning, or households that would rather keep a spare set ready than reorder later.
Who Should Consider Another Option
A first-time buyer who has not yet confirmed fit may prefer a four-pack. Buyers who want manufacturer-branded panels and the associated Maytronics warranty should choose the genuine 9991432-R4. S1 and S2 owners need their own filter families regardless of the appealing eight-pack quantity.
Pros
- Eight panels equal two four-panel replacement sets
- Listing targets the established 9991432-R4 cleaner group
- Convenient for owners who want a spare set stored in advance
- Can reduce repeat ordering for confirmed long-term users
Cons
- Extra quantity has little value if compatibility has not been confirmed
- Requires more careful storage to keep the second set undamaged
- Aftermarket panels do not carry the same manufacturer-backed status as genuine Maytronics parts
Detailed Buying Guide: Matching Dolphin Ultra-Fine Filters Correctly
9991432-R4: Nautilus CC Plus and the M-Line Panel Family
Part 9991432-R4 is a four-panel ultra-fine replacement family. The genuine Maytronics part is listed as a four-pack, and Maytronics shows it among replacement parts for the M400 and other compatible products. Several aftermarket products in this guide use the same reference and specifically name Nautilus CC Plus, M200, M400 or M500. The SUNRRA listing goes further and explicitly says it is not for Nautilus CC.
That explicit exclusion is useful because “CC” and “CC Plus” are easy to treat as minor naming differences. They are not minor for this purchase. If your cleaner is the smaller Nautilus CC, move to the S1 family rather than trying to make a 9991432 panel fit. If the cleaner is Nautilus CC Plus and your existing filters match the 9991432 family, then the genuine set, SUNRRA, Fil-fresh, the M400 replacement four-pack, TUOWS and PUREBURG become relevant comparisons.
9991460-R1 and 9991466-R4: Two S1 Replacement Strategies
The S1 family illustrates why the words “basket” and “panels” matter. The genuine 9991460-R1 is a complete ultra-fine basket assembly. The genuine 9991466-R4 contains four replacement panels. Maytronics lists overlapping S1 models for these parts, including Nautilus CC, Proteus DX3, S100, S50, E10, Active 10, Active 15 and Explorer E20 among others.
If your existing basket is mechanically sound, four replacement panels are the more focused repair. If the basket frame is cracked, distorted, or no longer latches correctly, the complete basket addresses both media and structure. The Ulticor basket and the aftermarket 9991460-R1 basket offer third-party full-assembly choices for similar S1-style applications, while the genuine 9991466-R4 is the clear panel-only OEM choice in this group.
9991467-R4 and 9991458-R1: S2 Panels Versus S2 Basket
The same panel-versus-basket logic appears in the S2 family. Genuine 9991467-R4 is a four-panel set used across many S2-style cleaners, including models such as S200, Active 20, Proteus DX4, Explorer E30, S300i and M600. The aftermarket 9991467-R4 listing in this guide targets several of those same cleaners.
Part 9991458-R1, by contrast, identifies a complete ultra-fine debris basket for S2-style robots. The Gearwiz listing is built around that basket reference. If the only worn components are the removable pleated panels, a four-panel 9991467 set avoids replacing a healthy basket. If the frame or full assembly needs replacement, a 9991458-style basket is the more relevant format.
Do Not Use Package Dimensions as a Substitute for Compatibility
Manufacturer package dimensions can confirm that one item is a full basket and another is a flat panel kit, but they are not installation dimensions. Packaging includes empty space and protective material. A package measurement should never be used to decide that a filter “looks close enough.” Use the exact robot model, manufacturer part family, and the geometry of the existing component.
When Ultra-Fine Media Is Most Useful
Ultra-fine filtration is most useful after the large debris load has been reduced. Fine sand, dust, light silt, pollen-like material, and other small particles can remain visible even when leaves are gone. Pleated media provides more surface area than a simple open screen, but this advantage is lost if the pleats are allowed to pack solid with debris.
How to Clean Pleated Ultra-Fine Panels
Remove the filter according to the cleaner’s normal access procedure and rinse loose material away before it dries. Direct water through the pleat channels from several angles and work across the panel methodically. Do not scrape the folds with rigid tools, crush them with a concentrated jet at very close range, or reinstall a panel while grit remains on the sealing edges.
For baskets, pay attention to corners, hinges, latches, and the top perimeter as well as the filter media. The assembly should go back into the robot without force. A basket that suddenly becomes difficult to seat may have trapped debris on a contact surface, a misaligned panel, or the wrong geometry for the cleaner.
When to Replace Instead of Rinse
A dirty filter and a worn filter are not the same. Normal discoloration or a heavy layer of sediment can often be addressed by cleaning. Replacement becomes more reasonable when the pleated material is torn, separated from its frame, permanently crushed, or still blocked after a thorough rinse. Cracked plastic, damaged tabs, and a basket that will not close securely are structural reasons to replace more than the media.
Maytronics recommends about 200 operating hours as a replacement checkpoint for genuine 9991432-R4 and 9991467-R4 panels. Treat that figure as part of a maintenance inspection: usage conditions vary, and physical condition should remain part of the decision.
How to Verify Fit Before the Return Window Closes
- Confirm the full robot name from its label, including suffixes such as CC, CC Plus, model number, or series designation.
- Compare the replacement-family number with the manufacturer parts listing or the existing filter documentation.
- Before removing packaging completely, place a new panel beside the old panel and compare the frame outline, corners, and retention features.
- For a complete basket, compare the top opening, latch points, handle area, and overall seating geometry.
- Install without trimming, bending, or forcing. A correct filter should engage using the cleaner’s normal mechanism.
Direct Product Comparisons
Genuine 9991432-R4 vs SUNRRA, Fil-fresh, M400 Replacement, TUOWS and PUREBURG
All six choices target the 9991432-R4 panel family, but their purchase logic differs. The genuine Dolphin/Maytronics set is the clearest choice for buyers who want manufacturer-branded media, a published one-year warranty, and Maytronics’ 200-hour replacement guideline. The four third-party four-packs—SUNRRA, Fil-fresh, the M400 replacement listing and TUOWS—compete mainly on aftermarket sourcing while keeping the standard four-panel quantity.
SUNRRA has the clearest naming warning because its title states “Not for Nautilus CC,” which can help prevent a CC-versus-CC-Plus error. PUREBURG differs by quantity: eight panels instead of four. That is useful for a buyer who has already confirmed fit and wants a second set in reserve, but it is less compelling for a first-time buyer who is still uncertain about compatibility.
Genuine 9991460-R1 Basket vs Genuine 9991466-R4 Panels
These two genuine S1 products should not be judged as direct substitutes by price or quantity because they replace different amounts of the filter assembly. The 9991460-R1 is a complete ultra-fine basket. The 9991466-R4 is a four-panel media set. If the basket structure is damaged, the complete assembly solves a problem that new panels cannot. If the basket is sound, the panel set replaces only the worn filtration surfaces and keeps the existing structure in use.
For a Nautilus CC owner, both part families can appear relevant in parts catalogs because they serve the same broad S1 ecosystem in different forms. The deciding question is therefore not “Which is better?” but “Which component is actually worn or damaged?”
Genuine 9991467-R4 Panels vs Gearwiz 9991458-R1 Basket
This is the S2 version of the same decision. The genuine 9991467-R4 is a four-panel replacement set. Gearwiz is a third-party full basket built around the 9991458-R1 family and lists S2 cleaners such as Active 20, Explorer E30, M600, Proteus DX4 and Triton PS. If the basket is healthy, panels are the narrower repair. If the complete assembly is damaged or a second ready-to-swap basket is desirable, the basket format provides that hardware.
Genuine 9991467-R4 vs Aftermarket 9991467-R4 Panels
Both products use the S2 9991467-R4 reference and are sold as four-panel sets. The genuine version comes with Maytronics’ official compatibility information, one-year warranty, and 200-hour replacement recommendation. The aftermarket set names a focused group of S2 cleaners, including S200, Proteus DX4, Active 20, Active 30, S300i and M600. The practical decision is therefore OEM sourcing versus a third-party replacement, after compatibility has already been established.
Ulticor Basket vs Aftermarket 9991460-R1 Basket
Both are full aftermarket basket options aimed at S1-style cleaners, and both listings include Nautilus CC among their target models. The second product explicitly uses 9991460-R1 in its title, which gives buyers a direct part-family reference. Ulticor instead presents a broad model list. For either one, compare the physical basket with the original assembly and confirm that the exact cleaner is covered before using it.
Common Buying Mistakes
Mistaking Nautilus CC for Nautilus CC Plus
This is the biggest naming trap in the group. Nautilus CC is part of the S1 ecosystem and appears with 9991460-R1 baskets and 9991466-R4 panels. Nautilus CC Plus is associated with 9991432-R4 panels. The extra word “Plus” changes the filter family, so do not remove it mentally when searching or reading a listing.
Buying Panels When the Basket Is Broken
Fresh media cannot fix a cracked frame, damaged handle, broken latch, or warped basket. Inspect the whole assembly before ordering. If the structure is compromised, choose the correct complete-basket family. If the structure is sound, panel-only replacement avoids unnecessary hardware.
Assuming All White Pleated Filters Are Interchangeable
Ultra-fine panels share a visual language: white pleats, molded borders, and rectangular shapes. That does not make them interchangeable. Differences in dimensions and retention geometry can be subtle in product photos. A correct part number and model match is more meaningful than a visual resemblance.
Treating an Aftermarket Compatibility List as an OEM Guarantee
Third-party products can work well when the seller has identified the correct replacement family, but their compatibility statements come from the third-party listing. Maytronics’ own parts pages remain the strongest reference for the genuine part family. Use aftermarket model lists as one check, not the only check.
Replacing a Dirty Filter Too Early
A filter that turns brown or gray after collecting silt may simply be doing its job. Rinse the pleats thoroughly before deciding the media is exhausted. Replace for damage, permanent blockage, poor sealing, or filtration that does not recover after cleaning rather than for appearance alone.
Buying Extra Packs Before Confirming Fit
Bulk quantities are convenient only after the correct family has been confirmed. An eight-pack can be useful for a long-term 9991432-R4 owner, but it doubles the number of unusable parts if the model match is wrong. First establish fit; then decide how much spare inventory makes sense.
Frequently Asked Questions
What is a Dolphin ultra fine filter used for?
An ultra-fine filter is used to retain smaller debris that can pass through a coarser screen. In a robotic pool cleaner, pleated ultra-fine media is especially useful for fine sediment, dust, and similar small particles. It should be rinsed regularly because dense pleats can load with debris faster than an open coarse filter.
Are Dolphin ultra-fine filters universal?
No. Dolphin cleaners use several filter families. In this guide, 9991432-R4, 9991466-R4, 9991467-R4, 9991460-R1 and 9991458-R1 refer to different panel or basket families. Match the exact cleaner and part family before buying.
Does a Nautilus CC Plus use the same ultra-fine filter as a Nautilus CC?
No. The two names are similar, but the filter families differ. Nautilus CC Plus is associated with the 9991432-R4 panel family, while Nautilus CC appears in the S1 family that includes 9991466-R4 panels and 9991460-R1 baskets.
What is the difference between 9991460-R1 and 9991466-R4?
Both relate to the S1 filtration family, but they replace different components. 9991460-R1 is a complete ultra-fine basket assembly. 9991466-R4 is a four-pack of ultra-fine replacement panels for a compatible existing assembly.
What is the difference between 9991458-R1 and 9991467-R4?
They are two S2-family replacement formats. 9991458-R1 identifies a complete ultra-fine basket, while 9991467-R4 is a four-panel ultra-fine replacement set. Choose based on whether the basket itself needs replacement or only the filtration panels.
How often should genuine Dolphin ultra-fine panels be replaced?
Maytronics gives a replacement recommendation of about 200 operating hours for genuine 9991432-R4 and 9991467-R4 panels. Physical condition still matters: torn, permanently clogged, distorted, or poorly sealing filters may need attention sooner.
Can I rinse and reuse an ultra-fine Dolphin filter?
Yes, routine rinsing is part of normal filter care. Flush debris from the pleat channels and clean the sealing edges before reinstalling. Replace the filter when damage or permanent blockage remains after cleaning rather than simply because the pleats are discolored.
Should I buy a four-pack or an eight-pack?
A four-pack is the normal complete panel quantity for many of the products in this guide. An eight-pack provides two sets and can be convenient after compatibility has been confirmed. If you are uncertain about fit, a smaller quantity reduces the amount of spare inventory at risk.
Is a genuine Dolphin filter always necessary?
A genuine part is not the only option shown here. Aftermarket replacements can be considered when they identify the correct part family and cleaner. Genuine Maytronics parts provide the clearest manufacturer compatibility and warranty reference, while third-party options may offer different quantities or basket formats.
Why does my new filter not fit even though it looks identical?
Similar pleated panels can differ in frame dimensions, edge shape, tabs, and retention geometry. Stop if the part needs to be forced. Recheck the cleaner model, part family, panel orientation, and whether debris is preventing the assembly from seating correctly.
Final Buying Considerations for a Dolphin Ultra Fine Filter
The most important decision is the filter family, not the brand name printed on the package. For Nautilus CC Plus and compatible M-line cleaners, 9991432-R4 is the central panel reference in this comparison. Genuine Maytronics offers the OEM four-pack, while SUNRRA, Fil-fresh, the M400 replacement set, TUOWS and PUREBURG provide aftermarket alternatives. PUREBURG is the only eight-panel option here, so it makes the most sense after fit is already established.
For the S1 family, decide whether you need media or the whole assembly. Genuine 9991466-R4 supplies four panels; genuine 9991460-R1 supplies a complete basket. Ulticor and the aftermarket 9991460-R1 listing provide full-basket alternatives for many S1-style cleaners. This is also the group where the Nautilus CC belongs, which is why CC owners should avoid 9991432-R4 products marketed for CC Plus.
For S2-style cleaners, genuine 9991467-R4 is the four-panel reference and the aftermarket 9991467-R4 product offers a similar panel format. Gearwiz instead targets the 9991458-R1 full-basket family. If the filter frame is healthy, panel replacement is the narrower repair. If the basket itself is damaged or a second complete assembly is useful, the basket format is the more logical direction.
Whichever product you choose, verify the exact cleaner name, compare the part family, and inspect the old component before ordering. After installation, the filter should seat normally without trimming or force. Regular rinsing then becomes the main maintenance task: fine pleats work by holding smaller debris, and keeping those pleats clear helps the cleaner continue moving water through the available filter area.
A dolphin ultra fine filter is therefore not one universal accessory. It is a category of filtration parts spread across several Dolphin cleaner families. Once the correct family and replacement format are identified, the remaining choice—genuine versus aftermarket, four panels versus eight, or panel set versus complete basket—becomes much easier to make.
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