Your Dolphin robotic pool cleaner can only pick up what its filter can hold. Once the filter media becomes clogged or worn, you will notice dirt, hair, and leaves left behind. Replacing it with quality Dolphin genuine replacement filters is one of the quickest ways to restore performance.
This guide reviews five fine and ultra-fine filter options for popular Dolphin robots. We evaluated the top Dolphin genuine replacement filters for 2026 and compared compatibility, build quality, and maintenance. If you want to browse the full selection, visit our Dolphin replacement filter category first.
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
- 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)
What to Look for in Dolphin Genuine Replacement Filters
Dolphin robotic cleaners rely on filters to trap everything from fine silt to large leaves. The right replacement depends on your model, the type of debris in your pool, and how often you clean it. Here are the four factors we evaluated.
Confirm Compatibility with Your Dolphin Model
Compatibility is the first thing to verify before ordering. Dolphin’s lineup spans older bag-style cleaners and newer panel-based robots. A part that fits an S100 may not fit an S200, and some baskets are not recommended for premium versions like the Nautilus CC Pro or Supreme. Check your current part number and compare it with the list on the product page.
For older robots, the Dolphin Genuine Replacement Part: Filter Bag is built for models like the Advantage, Deluxe 5, Discovery, DLX4, DLX5, Edge, and older Triton units. For more versatile coverage, the Ulticor Ultra Fine Filter Basket Compatible works with a long list of S50, S100, Active, Echo, Nautilus CC, and Explorer models, though not the Pro and Supreme versions.
Choose Between Fine and Ultra-Fine Filtration
Dolphin cleaners use two common filter media types: fine filter bags and ultra-fine pleated panels. Fine bags capture normal debris like leaves, sand, and hair, while ultra-fine pleated media traps finer particles that can cloud your water. If you deal with pollen, dust, or very fine dirt, an ultra-fine option is worth the upgrade.
The Dolphin fine filters guide breaks down the standard options, and our dolphin ultra fine filters article covers pleated alternatives. In this roundup, the Replace Part#9991467-R4 Ultra-Fine Filter Panels and the 9991467-r4 Ultra-Fine Filter Panels for Dolphin both target newer models such as Active 20, S300, M600, and Triton PS.
Evaluate Build Quality and Materials
Look for a sturdy frame and dense filter media. Cheap filters may deform under water pressure, allowing debris to bypass the filter entirely. High-quality pleated panels use a supportive ABS frame, while premium filter baskets rely on microfiltration fabric that picks up more dirt per pass.
The M400 Ultra Fine Cartridge Filter Replacement from Funmit features a heavy-duty ABS frame with pleated micro-paper for maximum hydraulic efficiency. The Ulticor basket also stands out for its microfiltration material and easy outdoor rinsing, which makes it a solid choice for routine maintenance.
Plan a Cleaning and Replacement Routine
All Dolphin filters need periodic cleaning to perform well. For most models, a quick rinse every 4 to 6 weeks keeps the filter free of oils, sand, and debris. Use a garden hose sprayer and rinse from the inside out so trapped particles release easily.
Even carefully maintained filters eventually lose their effectiveness. When the pleats flatten or the bag develops holes, replace it with a fresh Dolphin genuine replacement filter. You can find more maintenance tips in our Dolphin ultra fine filter basket guide.
Final Thoughts
Finding the right Dolphin genuine replacement filters does not need to be complicated. If you want a simple upgrade that fits many popular models, the Ulticor Ultra Fine Filter Basket Compatible is a dependable choice. If your robot uses individual panels and you prefer quick swaps, the Replace Part#9991467-R4 Ultra-Fine Filter Panels delivers solid ultra-fine filtration for newer Dolphin models. Match your filter to your model and cleaning habits, and your pool will stay noticeably clearer.
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Frequently Asked Questions
How often should I replace my Dolphin filter?
Most Dolphin filters last one to two seasons with regular rinsing. Replace the filter when you see tears, flattened pleats, or a noticeable drop in pickup performance. If you clean your pool frequently, you may need a fresh filter every year, especially with ultra-fine media.
How do I know which Dolphin replacement filter fits my cleaner?
As of 2026, the easiest way to know which Dolphin replacement filter fits your cleaner is to check the part number stamped on your current filter and compare it with the compatibility list on the product page. Many aftermarket filters cover multiple Dolphin models, but some are model-specific. When in doubt, consult your robot’s manual or our dolphin fine filter basket for model breakdowns.
What is the difference between a Dolphin fine filter bag and ultra-fine filter panels?
A fine filter bag catches standard pool debris such as leaves, hair, and larger particles. Ultra-fine filter panels use pleated media that traps much finer silt and pollen, which helps keep the water crystal clear. Your choice depends on your pool’s typical debris and your preference for filtration depth.
Can I wash and reuse Dolphin filters?
Yes, Dolphin filters are designed to be reused after rinsing. A garden hose works for most debris, but you can also soak the filter in a mild cleaning solution if oil or sunscreen residue is present. Always let the filter dry completely before storing your robot for the off-season.
