If you own a Dolphin robotic pool cleaner, you know that regular filter replacement is essential for sparkling water. But when it’s time to swap out those worn panels, you face a common dilemma: stick with expensive OEM filters from Maytronics or try affordable aftermarket alternatives? We’ve evaluated several top aftermarket options to help you decide which path offers the best value for your pool in 2026. This guide focuses on six aftermarket filter sets that claim to match or exceed OEM performance, so you can keep your Dolphin running efficiently without breaking your budget.
Whether you’re maintaining an Active 20, Nautilus CC Plus, or S200, the right filter makes all the difference. We’ll explore compatibility, filtration quality, and durability so you can choose with confidence. For related reading, check out our review of the best pool cleaner wall climbing brush to complement your cleaning setup.
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 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 Aftermarket Dolphin Filters
Compatibility with Your Dolphin Model
Not all aftermarket filters work with every Dolphin cleaner. Models like the Nautilus CC Plus use a different part number (9991432-R4) compared to the S200 or Active 20 (9991467-R4). Always verify the part number and your cleaner’s model list before purchasing. The products we feature cover a wide range: from the Doule King Fine Mesh Filter Basket for older S50 and Nautilus CC models to the SUNRRA Ultra Fine Filters for Nautilus CC Plus and M-series. Pay close attention to which models are excluded; for example, many 9991432-R4 filters explicitly do not fit the original Nautilus CC.
Filtration Efficiency: Pleated vs. Mesh
Most aftermarket filters use pleated paper or fabric to trap fine particles like algae, silt, and sand. Compared to OEM standard filters, pleated designs offer a larger surface area and better capture of microscopic debris. The Henkgo and CLLOMAGY panels claim ultra-fine filtration, while the Doule King offers a fine mesh basket specifically for larger debris. For pools with persistent fine particles, look for pleated ultra-fine panels; for leaves and twigs, a mesh basket like Doule King might be more effective. Many users combine both for complete coverage.
Build Quality and Durability
The frame material matters. ABS plastic frames resist cracking and deformation better than cheaper alternatives. SUNRRA and Funmit emphasize heavy-duty ABS frames that can withstand constant water flow and repeated rinsing. The filter paper itself should be tear-resistant and washable. Most aftermarket filters can last one to three years with proper care, matching OEM lifespans. We recommend rinsing every four to six weeks and replacing when the material starts to degrade.
Value and Pack Sizes
Best pool robot traction brush investments aside, filter replacement is a recurring cost. Aftermarket options typically cost significantly less per panel than OEM. Some sellers offer packs of four or eight panels, which can lower the per-unit cost even further. For example, the SUNRRA 8-pack provides great long-term value for compatible models. However, ensure the pack matches the number and size of filters your cleaner requires, most Dolphin robots use four panels per cartridge basket.Final Thoughts
After reviewing the options, we believe aftermarket filters can deliver excellent performance for a fraction of OEM costs. For owners of Dolphin S200, Active 20, or similar models, the Replace Part#9991467-R4 Ultra-Fine Filter Panels from Henkgo offers a strong balance of quality and affordability with a high rating for fine particle capture. If you have a Nautilus CC Plus or M-series cleaner, the SUNRRA Ultra Fine Filters (8-pack) provide exceptional value and durable construction that rivals OEM durability. Whichever you choose, proper maintenance will keep your Dolphin running smoothly all season long.
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- Dolphin Caddy Cover Review
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Frequently Asked Questions
Are aftermarket Dolphin filters as good as OEM?In our experience, high-quality aftermarket filters from reputable brands like SUNRRA and Henkgo perform just as well as OEM filters for most debris types. They use similar pleated materials and ABS frames. The key is to choose a filter that matches your model’s exact part number and follow proper cleaning routines. For the majority of pool owners, aftermarket alternatives offer comparable filtration at a lower cost.
How often should I replace Dolphin pool cleaner filters?We recommend replacing ultra-fine filter panels every six to twelve months for seasonal pools, or more frequently if your pool sees heavy use. Signs of wear include visible tears, reduced suction, or debris bypassing the filter. Rinsing the filters every four to six weeks extends their life. In 2026, with many aftermarket options available, you can stock up on replacements without overspending.
Yes, but only if the filter explicitly lists compatibility with the Nautilus CC Plus (not the original Nautilus CC). Many aftermarket filters for part #9991432-R4 are designed for the Plus model. Always double-check the product description and your cleaner’s manual. If you’re unsure, our guide to robotic pool cleaner accessories can help you find the right fit.
What is the difference between ultra-fine and mesh filter baskets?Ultra-fine pleated filters capture tiny particles like algae and fine silt, while mesh baskets (like the Doule King) are better at trapping larger debris such as leaves and pine needles. Some Dolphin models allow you to swap between them depending on the season. For general cleaning, ultra-fine panels provide the best water clarity. For heavy leaf loads, a mesh basket can save you from frequent rinsing.
