Your Dolphin robotic pool cleaner works hard to keep your pool floor spotless, but even the best robot needs a clean filter to perform at its peak. Over time, filter cartridges clog with fine debris, reducing suction and water flow. Replacing them with the right panels is essential for maintaining sparkling water and extending your cleaner’s lifespan. In this Dolphin filter cartridge review, we evaluate six top replacement options for 2026, covering ultra-fine pleated panels, spring filters, and compatible models for popular Dolphin series like Nautilus CC Plus, M400, M500, S200, and more. Whether you need a budget-friendly pack or a premium set, this guide will help you find the perfect match.
If you are also considering a solar-powered skimmer for surface debris, check out our betta SE pool skimmer review for another way to keep your pool clean.
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 a Dolphin Filter Cartridge
Choosing the right replacement filter for your Dolphin pool cleaner involves more than just matching the part number. Here are the key factors to consider before you buy.
Compatibility with Your Dolphin Model
Not all Dolphin filters fit every model. The most common part numbers are 9991432-R4 (used by Nautilus CC Plus, M400, M500, and many others) and 9991467-R4 (used by S200, S300i, M600, and more). Always verify your cleaner’s model number against the product’s compatibility list. For example, the Poolzilla Ultra-Fine Filters (9991432-R4) work with Aquarius XL, Sigma, and Wave series, but not with older Nautilus CC or Triton PS. The Henkgo panels (9991467-R4) fit Active 20, Proteus DX4, and Warrior SE. Double-checking saves you the hassle of returns.
Filtration Type: Ultra-Fine vs. Spring
Ultra-fine pleated panels capture tiny particles like silt, pollen, and fine sand, leaving your pool water crystal clear. They are ideal for routine maintenance. Spring filter cartridges, like the Kerneed set, use a screen material designed to trap larger debris (leaves, twigs) without clogging quickly. If your pool is especially dirty after a storm, spring filters can handle the first couple of cleanings before switching to ultra-fine panels. Many users keep both types on hand for different seasons.
Build Quality and Durability
The frame material matters. Heavy-duty ABS plastic resists cracking and warping under constant water pressure. Look for reinforced edges and tightly bonded pleats. Brands like SUNRRA and Funmit emphasize sturdy frames that can last two to three years with proper care. Rinsing the filters every four to six weeks with a garden hose extends their life significantly. Avoid panels with thin, flimsy plastic that may break during cleaning.
For more tips on maintaining your pool equipment, read our best pool cleaner wall climbing brush for complementary cleaning tools.
Value for Money: Packs and Longevity
Most replacement filters come in packs of four, which is exactly what your Dolphin basket needs. Prices vary, but the cost per panel is what matters. Some packs offer a lower upfront cost but may need replacement sooner. Others, like the Funmit M400 set, are priced slightly higher but boast premium filter paper and a durable frame. Consider how often you clean your pool and the typical debris load. A slightly more expensive set that lasts two years can be more economical than buying cheap panels every six months.
If you are exploring other pool cleaning solutions, our polaris freedom review covers a cordless robotic cleaner that might interest you.
Final Thoughts
After evaluating these six Dolphin filter cartridge options, we recommend the SUNRRA Ultra Fine Filters for owners of Nautilus CC Plus, M400, or M500 who want reliable ultra-fine filtration backed by a one-year warranty. For those with a Dolphin S200, M600, or Proteus DX4, the Henkgo Ultra-Fine Filter Panels offer excellent compatibility and easy numbered installation. Both sets deliver the performance your Dolphin needs to keep your pool inviting all season long.
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Frequently Asked Questions
How often should I replace my Dolphin filter cartridges?
Most manufacturers recommend replacing the filter panels every one to two years, depending on usage and pool conditions. If you notice reduced suction or cloudy water, it is time for a swap. Rinsing them every four to six weeks can extend their life.
Can I use spring filters and ultra-fine filters together?
No, the Dolphin filter basket holds four identical panels. You must choose either all spring or all ultra-fine filters for a given cleaning cycle. Some pool owners alternate between the two: spring for heavy debris cleanups, ultra-fine for routine maintenance.
Are aftermarket filter panels as good as OEM Dolphin filters?
Many aftermarket brands like SUNRRA, Funmit, and Poolzilla use high-quality materials that match or exceed OEM specifications. They often cost less while providing equivalent filtration. Always check compatibility and read user feedback to ensure quality. For a deeper dive into robotic cleaners, see our polaris VRX iQ plus review.
How do I clean Dolphin filter cartridges properly?
Remove the panels from the basket and spray them with a garden hose from the inside out. Use moderate water pressure to dislodge debris trapped in the pleats. Avoid using a pressure washer or harsh chemicals, as they can damage the filter material. Let them air dry completely before storing.
For more on solar-powered skimmers, read our betta SE solar review for an alternative surface cleaning solution.
