Your Dolphin Nautilus CC Supreme works hard to keep your pool spotless, but even the best robotic cleaner needs fresh filters to maintain top performance. Over time, the original ultra-fine cartridges lose efficiency, letting fine debris slip through and clouding your water. That’s where a quality replacement set comes in. In this guide, we review six top-rated replacement filters for the Dolphin Nautilus CC Supreme, covering everything from compatibility to filtration power. Whether you need a budget-friendly four-pack or a bulk eight-pack for heavy use, we have you covered.
All the filters we highlight are compatible with part number 9991432-R4 and fit the Nautilus CC Supreme along with many other Dolphin models like the M400, M500, and Triton Plus. They use pleated ultra-fine material to trap tiny particles, and most are washable for repeated use. We’ve carefully assessed each product’s build quality, value, and customer feedback to help you make the right choice. If you’re also curious about other Dolphin Nautilus CC replacement filters, check out our dedicated guide.
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 Dolphin Nautilus CC Supreme Filters
Compatibility with Your Dolphin Model
Not all filters fit every Dolphin model, even if they look similar. Always check that the replacement is designed for the Nautilus CC Supreme and carries the part number 9991432-R4. Most products listed here also work with the Nautilus CC Plus, M200, M400, M500, Sigma, Odyssey, and several others. However, they are not compatible with the original Nautilus CC or older Triton units. Double-check your cleaner’s model before ordering to avoid a mismatch.
Filtration Efficiency and Material
The best filters use pleated ultra-fine paper or fabric that captures sand, algae, and even microscopic debris. More pleats means more surface area, which improves water flow and trapping ability. Look for cartridges with a dense pleat count and a sturdy frame that won’t warp under pressure. Washable designs let you reuse them multiple times, saving money over the long run. Rinsing every four to six weeks keeps performance high.
Build Quality and Durability
A filter’s frame matters almost as much as the media. Heavy-duty ABS plastic resists cracking and holds up to repeated cleaning cycles. Some brands reinforce the edges to prevent the pleats from separating. A well-built filter can last two to three years with proper care. Avoid flimsy frames that may break inside your cleaner and cause damage. We prioritized products with strong construction and positive long-term feedback.
Pack Size and Value
Filters are sold in packs of four or eight. A four-pack typically lasts a full season if you rotate and clean them regularly. An eight-pack offers even better value per cartridge and is ideal for large pools or heavy debris. Consider how often you clean your pool and how many spare sets you want on hand. Buying in bulk reduces the per-unit cost and means fewer reorders. For more insights, see our ultra-fine filter comparison.
Final Thoughts
After reviewing the top options, the Poolzilla Pool Cleaner Ultra-Fine Filters stand out for their exceptional 4.8-star rating and affordable four-pack, making them a great choice for budget-conscious owners who still want premium filtration. For those who prefer a bulk supply, the SUNRRA Ultra Fine Filters Compatible with Dolphin eight-pack delivers outstanding value and durability, backed by a one-year warranty. Whichever you choose, you will enjoy crystal-clear pool water and a cleaner that runs at its best all season long.
Related Guides
- Best Dolphin Robot Pool Cleaner Picks for 2026
- Dolphin Caddy Cover Review
- Dolphin Premier Caddy Review
Frequently Asked Questions
How often should I replace Dolphin Nautilus CC Supreme filters? With regular rinsing every four to six weeks, these ultra-fine filters can last two to three years. Replace them when the pleats become frayed or the frame warps, or if you notice reduced suction and water clarity.
Can I wash and reuse these filters? Yes, all the filters we reviewed are washable and reusable. Simply remove them from the cleaner, rinse with a garden hose, and let them air dry. Avoid using a washing machine or harsh chemicals, as that can damage the pleats.
Will these filters work with my Dolphin Nautilus CC (not Supreme)? No, these filters are specifically designed for the Nautilus CC Supreme and other models listed in the compatibility notes. The original Nautilus CC uses a different filter part number and is not compatible. Always verify your model before purchasing.
What is the difference between fine and ultra-fine filters for the Dolphin Nautilus CC Supreme? Ultra-fine filters have more pleats and a tighter weave, capturing particles as small as a few microns. They are ideal for fine debris like pollen, algae, and dust. Standard fine filters are less dense and better suited for larger debris. For a sparkling pool, ultra-fine is the way to go in 2026.
