Your Dolphin robotic pool cleaner works hard every season, but its filter is the unsung hero. Over time, fabric panels wear out, pleats lose their shape, and fine debris starts slipping through. If you have noticed cloudy water or extra silt settling on the pool floor, a fresh set of replacement filters can restore that crisp clarity. In this guide, we assessed eight top-rated Dolphin replacement filters from brands like Ulticor, SUNRRA, Funmit, and more. Whether you own a Nautilus CC Plus, an S200, or an Active 20, we have a match for your model. Let us dive in.
For pool owners dealing with stubborn silt, our guide to robotic pool cleaner filters for silt offers additional insights. But if you simply want the best replacement filters for your Dolphin right now, keep reading.
Pros
- High-efficiency microfiltration captures fine dirt, sand, and leaves for pristine pool water.
- Works with a wide range of popular Dolphin robot models, reducing the need for multiple filter types.
- Easy to clean and maintain with no special tools required.
- Affordable price compared to manufacturer replacement filters.
- Solid build quality with lightweight yet sturdy plastic construction.
Cons
- Not compatible with Dolphin Nautilus CC Pro or CC Supreme models, limiting its use for newer variants.
- Older versions of Active 10 or S50 may require removal of a plastic piece for proper fit, which could be inconvenient for some users.
- As an aftermarket part, it may not perfectly match OEM quality or warranty coverage.
The Ulticor Ultra Fine Filter Basket is an aftermarket replacement designed specifically for a wide array of Dolphin robotic pool cleaners. It is an ideal choice for pool owners who already own compatible models such as the Dolphin S50, S100, Active 10/15, Echo, T15, T25, Proteus DX3, Saturn, Cayman, Escape, and others. This basket is not intended for the Nautilus CC Pro or Supreme versions, so buyers should verify compatibility before purchasing.
What sets this filter apart is its microfiltration technology, which captures even the tiniest debris particles. In real-world use, this translates to a noticeably cleaner pool with clearer water, as fine dirt, sand, and pollen are effectively trapped. The basket is easy to rinse and clean every four to six weeks, maintaining peak performance without hassle. Users report that it fits snugly and works reliably cycle after cycle.
The design is straightforward: a white, lightweight plastic basket measuring roughly 9x5x7 inches. Build quality feels solid for an aftermarket part, though it may not have the exact finish of an OEM component. The inclusion of installation tips for older Active 10 or S50 units (which may need a small internal plastic piece removed) shows attention to compatibility details. A video guide is available upon request to assist with that adjustment.
Potential drawbacks are mostly centered on fitment limitations. Owners of Nautilus CC Pro or Supreme will need to look elsewhere. Also, the need to modify older robots could be a minor inconvenience for those not comfortable with simple DIY tasks. However, for the vast majority of compatible users, installation is plug-and-play.
Overall, the Ulticor Ultra Fine Filter Basket offers excellent value for money. It delivers superior filtration at a lower price than official replacements, while covering a wide range of popular Dolphin models. If you own one of the listed robots and want to keep your pool sparkling clean without breaking the bank, this filter is a smart buy.
Pros
- Ultra-fine filtration traps even tiny particles for superior water clarity.
- Easy numbered installation system reduces setup time and guesswork.
- Washable and reusable design offers long-term value and eco-friendliness.
- Broad compatibility with many Dolphin and Maytronics robotic pool cleaner models.
- Sturdy build quality withstands regular use and cleaning without tearing.
Cons
- May require more frequent cleaning than standard filters due to ultra-fine mesh trapping more debris.
- Not compatible with all Dolphin models; double-check compatibility before purchase.
- Some users may find the initial fit slightly tight on certain cleaner baskets.
The Henkgo ultra-fine filter panels are a direct replacement for the OEM part 9991467-R4, designed specifically for Dolphin robotic pool cleaners. These pleated cartridge filters are ideal for pool owners who want to maintain sparkling water without frequent skimming. They fit a wide range of models including the S200, Active 20, Proteus DX4, M600, and many more, making them a versatile upgrade for most Dolphin owners.
Standout features include the ultra-fine pleated material that captures sand, gravel, leaves, and even microscopic debris. In real-world use, these filters dramatically improve water clarity compared to standard mesh filters. The numbered panels (1-4) simplify installation: remove in order and replace in reverse, so even first-time users can swap them in minutes. The filters are also washable with a garden hose, retaining their shape and effectiveness after repeated cleanings.
Build quality is reassuringly sturdy. The pleated material holds up well under water pressure and regular cleaning. Each panel measures 9 x 8 x 2.1 inches and weighs just over a pound, making them lightweight yet durable. The white color blends inconspicuously into most pool cleaner baskets. Compatibility is extensive, covering over 25 Dolphin and Maytronics models, which adds significant value for households with multiple cleaners or future upgrades.
One potential drawback is that the ultra-fine mesh may clog faster than coarser filters, especially in heavily debris-laden pools. This means more frequent cleaning sessions, but the ease of rinsing offsets this inconvenience. Additionally, while compatibility is broad, it is not universal, so buyers should verify their specific model before ordering. The initial fit on some cleaner baskets might feel snug, but this ensures a secure seal.
Overall, the Henkgo ultra-fine filter panels offer an excellent balance of performance, durability, and affordability. They deliver professional-grade filtration at a fraction of the OEM cost. For Dolphin pool cleaner owners seeking clearer water and less maintenance, these filters are a smart investment. The simple installation and reusable design make them a practical choice for any pool season.
Pros
- Superior filtration with ultra-fine pleats that trap even small debris.
- Durable ABS plastic construction resists ripping and deformation.
- Compatible with multiple popular Dolphin robotic pool cleaner models.
- Cost-effective 4-pack offers great value compared to OEM replacements.
- Simple swap-out installation with no tools needed.
Cons
- Limited compatibility to specific Dolphin models, not universal.
- May require more frequent cleaning if pool has heavy debris loads.
- No customer reviews yet to confirm long-term performance.
The FFyan 4-pack pool cleaner filters are designed as a direct replacement for select Dolphin robotic pool cleaners, including the Premier, DX6, Deluxe 4, Deluxe 5, DLX4, and DLX5 models. These filters are ideal for pool owners who want to maintain optimal performance and water clarity without paying premium prices for OEM parts.
The standout feature is the ultra-fine pleated filter material that captures smaller particles such as sand, sediment, and leaves more effectively than standard fabric filters. The increased number of pleats provides a larger surface area, enhancing filtration efficiency and helping to keep your pool bottom crystal clear.
Built with heavy-duty ABS plastic, the filter frame is resistant to ripping and deformation even under continuous water flow. This sturdy construction ensures long-term structural stability and reliable performance, making it a durable upgrade over some original equipment filters.
One potential drawback is that these filters are only compatible with the listed Dolphin models, so owners of other robotic cleaners should verify fit before purchasing. Additionally, while the fine pleats excel at trapping debris, they may require more frequent cleaning in pools with heavy leaf or dirt loads.
Overall, the FFyan filter pack offers great value for Dolphin pool cleaner owners seeking an affordable, high-performance replacement. With enhanced filtration and robust build quality, these filters are a smart choice for maintaining a sparkling clean pool throughout the season.
Pros
- Superior filtration from ultra fine pleated material, outperforming standard non-pleated filters.
- Durable ABS frame withstands regular use and chemical exposure without cracking.
- Cost-effective 4-pack reduces per-cartridge cost and frequency of replacement.
- Easy to clean and reuse, extending the life of each filter panel.
- Backed by a 1-year warranty for added confidence.
Cons
- Not compatible with older Nautilus CC, Nautilus (original), or Triton models; verify your robot before ordering.
- Some users may find the initial fit slightly snug in certain robot models, though it settles over time.
- Pleated filters may require more frequent rinsing in heavy-debris pools compared to coarse mesh options.
The SUNRRA Ultra Fine Filters are a versatile replacement option for a wide range of Dolphin robotic pool cleaners, including the Nautilus CC Plus, CC Supreme, M200, M400, M500, and many others. If you own one of these popular Maytronics models and want to improve water clarity, this 4-pack of pleated cartridges is a smart upgrade.
What sets these filters apart is their ultra fine pleated construction. Unlike standard non-pleated cartridges that let fine sediment slip through, the dense pleats trap even tiny particles like algae, pollen, and dust. The result is noticeably clearer pool water and a cleaner floor after each cycle. In real-world use, the filtration performance is excellent, especially for pools that struggle with cloudy water.
The build quality is solid: the frame is made from heavy-duty ABS plastic that resists cracking and tearing, even after repeated rinsing and seasonal storage. SUNRRA claims a lifespan of 2-3 years, which is reasonable if you clean them every 4-6 weeks. The 4-pack also means you have spares on hand, saving you from last-minute replacements.
One important note: these filters are not compatible with the original Nautilus CC, older Nautilus, or Triton series models. Always double-check your robot's model number before purchasing. Also, because the pleats are so fine, they may clog faster in pools with heavy leaf debris; you may need to rinse them more often than coarse mesh filters.
Overall, the SUNRRA Ultra Fine Filters offer excellent value for Dolphin owners who want premium filtration without paying premium prices. The 1-year warranty adds peace of mind, and the 4-pack ensures you're set for multiple seasons. If your robot is compatible, this is a highly recommended upgrade for crystal-clear pool water.
Pros
- Designed to replace Maytronics 9991432-R4 for many Dolphin robotic cleaner models
- Ultra fine pleated media traps both small particles and larger debris effectively
- Reinforced ABS frame keeps the filter stable during operation
- 4 pack provides good value and a longer interval before you need to reorder
- Simple maintenance with periodic rinsing every 4 to 6 weeks
Cons
- Not compatible with many Dolphin models such as Nautilus CC, M600, S200, Triton PS, and others, so check fit carefully before buying
- Aftermarket part is not an original Maytronics product, which may matter to some buyers
- No customer reviews are available yet, so long-term real-world performance is less proven
The Funmit M400 Ultra Fine Cartridge Filter is a 4 pack replacement designed for the Dolphin Nautilus CC Plus and a wide range of compatible robotic pool cleaners. It replaces Maytronics part 9991432-R4, making it a practical option for pool owners who want dependable filtration without the premium price of the OEM part.
The standout feature is the ultra fine pleated filter paper, which captures sand, leaves, hair, and other debris while maximizing surface area. The heavy duty ABS plastic frame keeps the pleats stable during operation and prevents the filter from deforming under water flow, so the cleaner maintains strong suction and consistent performance.
Maintenance is straightforward: rinsing the filter every 4 to 6 weeks is enough to keep it working well, and with proper care each filter can last 2 to 3 years. The 4 pack is especially convenient for owners who clean frequently or have a large pool, because there is always a fresh filter on hand.
The main drawback is compatibility. This filter does not fit several popular Dolphin models, including Nautilus CC, M600, S200, Triton PS, and others, so it is essential to verify your pool cleaner model before purchasing. As an aftermarket part, it also does not carry the original manufacturer branding, though the build quality is solid for the price.
Overall, the Funmit M400 filter replacement offers strong filtration, durable construction, and good value for owners of compatible Dolphin robotic cleaners. If you confirm the fit first, this 4 pack is a smart, budget friendly way to keep your pool clear all season.
Color: White
Dimensions: 10.5 x 6.375 x 10.5 inches
Package includes: 4 cartridge filters
Replaces Maytronics part 9991432-R4
Compatible with Dolphin Nautilus CC Plus, M400, M500, M200, M4, M5, Wave 65, Wave 90, C3, C4, Oasis Z5i, Aquarius XL, Liberty, Odyssey, Sigma, Triton Plus (old)
Buying Guide: What to Look for in a Dolphin Replacement Filter
Compatibility with Your Dolphin Model
Not every filter fits every Dolphin. Manufacturers group models by part numbers like 9991432-R4 or 9991467-R4. Always double-check your cleaner’s model number against the filter’s compatibility list. For example, the Nautilus CC Plus uses a different panel than the older Nautilus CC. A mismatch means the door won’t close or the filter won’t seat properly. Most brands in our list clearly state which models work and which do not, so read the fine print before buying.
If you own a Dolphin that handles sand well, you might also find value in our best robotic pool cleaner filter for sand recommendations. But for everyday replacement, compatibility is step one.
Filtration Efficiency: Ultra-Fine vs. Standard
Ultra-fine pleated filters capture particles as small as a few microns, including silt, pollen, and fine sand. Standard fabric filters let more pass through. For crystal clear water, choose a pleated ultra-fine panel. The Ulticor Ultra Fine Filter Basket uses microfiltration technology, while SUNRRA and Funmit offer dense pleats that trap debris without clogging too quickly. If your pool sees heavy leaf or algae debris, a spring filter (like the Kerneed option) can be used first to catch large items, then swap to ultra-fine for polishing.
For a deeper look at fine debris removal, check our best robotic pool cleaner filter for fine debris article. It covers similar principles.
Build Quality and Durability
A filter that rips or deforms after a few months is a waste of money. Look for heavy-duty ABS plastic frames and reinforced pleated paper. Brands like FFyan and Henkgo emphasize sturdy construction that resists warping from water flow. The SUNRRA filter claims a lifespan of two to three years with proper rinsing. Rinse every four to six weeks with a garden hose to maintain flow. Avoid putting filters in a washing machine or using harsh chemicals.
Washable filters are convenient; our best robotic pool cleaner filters washable guide highlights models that clean easily. For saltwater pools, check our best replacement filter for saltwater pools recommendations.
Value for Money: Price vs. Pack Size
Most Dolphin filters come in four-packs, which should last a full season or longer if maintained. Some brands offer single baskets (like Ulticor) that replace the entire filter assembly, while others sell individual panels. The Ulticor basket costs more upfront but may simplify swapping. The Poolzilla four-pack is budget-friendly and fits many popular models. Compare the cost per panel and consider how often you clean your pool. A slightly higher upfront investment in a durable filter can save money over time.
Final Thoughts
After reviewing eight of the best Dolphin replacement filters on the market, two stand out for different needs. For owners of the Nautilus CC Plus, M400, or M500, the SUNRRA Ultra Fine Filters offer a perfect fit and reliable pleated performance at a fair price. If you have an older Dolphin like the S50 or Active 10, the Ulticor Ultra Fine Filter Basket replaces the entire basket with microfiltration technology and includes helpful installation support. Whichever you choose, a fresh filter will restore your robot’s cleaning power and keep your pool inviting all season.
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Frequently Asked Questions
How often should I replace my Dolphin pool cleaner filter?
Most manufacturers recommend replacing ultra-fine pleated filters every 12 to 18 months, depending on pool usage and debris load. If you notice reduced suction or cloudy water after cleaning, it is time for a swap. Rinsing every four to six weeks extends the life.
Can I wash Dolphin replacement filters in a dishwasher?
No. Dishwasher detergents and heat can damage the pleated paper and warp the plastic frame. Hand rinse with a garden hose using moderate pressure. For stubborn debris, soak in a bucket of water with a mild pool filter cleaner, then rinse thoroughly.
Are aftermarket filters as good as OEM Dolphin filters?
Many aftermarket brands like SUNRRA, Funmit, and Ulticor use high-quality materials and often match or exceed OEM filtration. They cost less and are widely compatible. Just verify the part number and model list to ensure a proper fit. In 2026, aftermarket options have become the go-to choice for savvy pool owners.
What is the difference between 9991432-R4 and 9991467-R4 filters?
Part 9991432-R4 fits Dolphin Nautilus CC Plus, M200/M400/M500, and similar models. Part 9991467-R4 fits the Active 20/30/40, S200/S300, and others. They are not interchangeable. Always match the part number to your cleaner’s manual or existing filter.
