Your pool sparkles after a deep clean, but within hours, fine sand, dust, and algae particles turn the water hazy again. Standard filter cartridges let these tiny invaders pass right through, leaving you frustrated. This Cyber Monday, solving that problem becomes affordable with ultra-fine filter panels designed specifically for robotic pool cleaners. Whether you own a Dolphin, TigerShark, or AquaVac, we have evaluated the best replacements that trap even micron-level debris. Our guide covers four top-rated products, each offering pleated construction and easy installation. For a broader look at smart cleaning technology, check out our best smart pool cleaner cyber monday deals 2026.
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 ultra-fine filter for your pool robot means matching your needs to the product’s design and compatibility. Below, we break down the key factors to consider before adding one to your cart.
Filter Material and Design
Pleated filter paper with a heavy-duty ABS frame captures fine particles more efficiently than standard mesh. The pleats increase surface area, trapping sand, dust, and algae without clogging quickly. Look for panels labeled ultra-fine or pleated, as they provide maximum filtration. For more on accessories that enhance cleaning, explore our ACCESSORIES category.
Compatibility with Your Robot
Not every filter fits every cleaner. Dolphin models like the S200, M600, and Nautilus CC Plus require specific part numbers. Other brands such as TigerShark, SharkVac, and AquaVac use different shapes. Always confirm your robot’s model number before buying. Browse our Cyber Monday page for more deals on compatible units.
Ease of Maintenance
Ultra-fine filters should be rinsed every four to six weeks for best performance. A garden hose sprayer with moderate pressure cleans the pleats quickly. Some panels are numbered for easy replacement order. Simple upkeep extends the life of the filter to two or three years. Pair with a quality brush for overall cleanliness; see our best pool cleaner dual brush review.
Final Thoughts
For most Dolphin owners, we recommend the Replace Part#9991467-R4 Ultra-Fine Filter Panels for its robust pleated construction and straightforward fit. If you own a TigerShark or AquaVac, the SUNRRA Ultra Fine Filter Compatible delivers durable performance and a true one-year warranty. Both options will keep your water crystal clear without breaking the bank this Cyber Monday.
Frequently Asked Questions
Can I use these ultra-fine filters in any robotic pool cleaner?
No, they are designed for specific models. The Henkgo and Funmit filters fit many Dolphin units, while the SUNRRA panel works with TigerShark, SharkVac, and AquaVac. Always check your robot’s part number before purchasing.
How often should I clean the filter?
Rinse the panels every four to six weeks under a garden hose. For heavy debris or during peak summer, clean more frequently to maintain optimal water flow. Proper care can extend the filter’s life to two or three years.
Will these filters capture algae and fine dust?
Yes, the pleated ultra-fine paper traps particles as small as sand, dirt, and algae spores. They are far more effective than standard mesh filters at keeping your pool water pristine.
Are these filters washable and reusable?
Absolutely. Rinse them with a spray nozzle and they are ready to reuse. Avoid using soap or harsh chemicals, as these can degrade the filter material. For more tips on maintaining your robot, see our WiFi robotic pool cleaner cyber monday deals guide.
