Your robotic pool cleaner works hard all season, but its filter cartridge takes the brunt of the dirt. Over time, even the best filters lose efficiency, leaving debris behind and reducing suction power. If you have noticed your pool cleaner leaving trails of sand or struggling to pick up leaves, it is likely time for a robotic pool cleaner filter cartridge replacement. In this guide, we review seven top-rated replacement filters for 2026 to help you restore peak performance without overspending. Whether you own a Hayward, Dolphin, or other popular brand, you will find a compatible option here.
We have assessed each product for fit, filtration quality, and durability. Our picks range from affordable multi-packs to ultra-fine pleated panels that capture microscopic particles. For more background on keeping your robot in top shape, check out our guide on best robotic pool cleaner ultra fine filter baskets.
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
- 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: Choosing the Right Replacement Filter
Not all filter cartridges are created equal. Here are the key factors to consider when shopping for a robotic pool cleaner filter cartridge replacement.
Compatibility with Your Pool Cleaner Model
The most important criterion is fit. A filter that does not match your cleaner’s basket will not seal properly, letting debris bypass the filtration system. Always verify the part number and model compatibility before purchasing. Many aftermarket filters list dozens of compatible models, but double-check your specific robot. For example, the 4 Pack for Hayward Sharkvac Filters RCX70101PAK2 works exclusively with Hayward TigerShark, SharkVac, and AquaVac series, while the Poolzilla Pool Cleaner Ultra-Fine Filters fit a wide range of Dolphin models.
If you are unsure about your cleaner’s model, consult the user manual or search online. Our article on top replacement filters for pool robots includes a helpful compatibility chart.
Filtration Efficiency: Standard vs. Ultra-Fine
Standard filter cartridges catch larger debris like leaves and twigs, but ultra-fine pleated panels trap sand, silt, and even algae spores. If your pool tends to get cloudy or you have fine dust settling on the floor, opt for ultra-fine replacements. Products like the Replace Part#9991467-R4 Ultra-Fine Filter Panels use pleated PET material that increases surface area without restricting water flow. This means better capture rates and longer intervals between cleaning.
For a deeper dive into ultra-fine options, read our review of ultra fine filters for robotic pool cleaners.
Durability and Build Quality
A replacement filter should withstand repeated washing and the rigors of daily pool cleaning. Look for heavy-duty ABS plastic frames that resist cracking and pleated filter media that holds its shape. The M400 Ultra Fine Cartridge Filter Replacement from Funmit features a reinforced frame and super-fine filter paper, promising up to three years of use with proper care. Similarly, the SUNRRA Ultra Fine Filter boasts a durable ABS frame and pleated design that traps particles efficiently.
Cheaper filters may warp after a few washes, so investing a little more upfront can save you money in the long run.
Ease of Cleaning and Maintenance
Most robotic pool cleaner filters are washable and reusable, but some designs are easier to clean than others. Ultra-fine pleated panels often require a gentle spray with a garden hose, while standard mesh filters can be rinsed more aggressively. All the products we reviewed are designed for simple removal and cleaning. The 9991467-r4 Ultra-Fine Filter Panels for Dolphin come numbered for easy installation and removal, making maintenance a breeze. Regular rinsing every four to six weeks keeps performance high and extends filter life.
For more maintenance tips, see our guide on top pool robot replacement filters.
Final Thoughts
Choosing the right robotic pool cleaner filter cartridge replacement comes down to your cleaner’s make and your pool’s specific needs. For Hayward owners, the 4 Pack for Hayward Sharkvac Filters RCX70101PAK2 offers an unbeatable combination of value and performance, with a diamond-grid weave that catches fine debris without clogging. If you have a Dolphin model, the Poolzilla Pool Cleaner Ultra-Fine Filters deliver exceptional filtration at a budget-friendly price, backed by responsive customer support. Whichever you choose, regular replacement and cleaning will keep your pool sparkling all season long.
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Frequently Asked Questions
How often should I replace robotic pool cleaner filters?
With proper care and regular rinsing, most filter cartridges last between one and three years. However, if you notice reduced suction or visible damage like tears or warping, replace them sooner. For heavy-use pools or those with lots of debris, consider swapping filters every season.
Can I wash and reuse these filter cartridges?
Yes, almost all robotic pool cleaner filters are designed to be washed and reused. Simply remove the cartridge and spray it with a garden hose. For ultra-fine pleated panels, use moderate pressure to avoid damaging the media. Avoid using harsh chemicals or putting them in a washing machine.
Are aftermarket filters as good as the original brand ones?
Many aftermarket filters are manufactured to the same specifications as OEM parts, often at a lower cost. The products we reviewed use high-quality materials like PET fiber and ABS plastic, and they have been validated for fit and performance. Just ensure you choose a reputable brand and check compatibility with your specific cleaner model.
What is the difference between standard and ultra-fine filters?
Standard filters capture larger debris such as leaves and twigs, while ultra-fine filters use pleated material to trap fine particles like sand, silt, and algae. Ultra-fine filters are ideal for maintaining crystal-clear water, especially in pools with fine sediment. They may require slightly more frequent cleaning but offer superior filtration.
