You rely on your Dolphin Nautilus CC to scrub your pool day after day, but even the best robot can only do so much with a clogged or worn filter. When fine debris like algae spores, dust, and tiny leaves turn your pool water cloudy, switching to an ultra-fine filter makes all the difference. In this guide, we review the top replacement filters and baskets designed for the Dolphin Nautilus CC and its compatible cousins, so you can find the perfect match for your cleaning routine. Whether you own the original Nautilus CC, the Nautilus CC Plus, or a similar model like the M400 or Sigma, we have you covered.
Before we dive into the options, a quick note: The Nautilus CC and Nautilus CC Plus use different filter systems. Many aftermarket parts labeled for the Nautilus CC Plus will not fit the original Nautilus CC. Be sure to double-check your model number and part compatibility before purchasing. For a broader look at aftermarket options, browse our dolphin aftermarket replacement filters.
Pros
- Microfiltration prevents clogging and maintains strong suction for thorough cleaning
- Sturdy ABS construction ensures durability even in heavy-duty use
- Wide compatibility saves hassle of finding exact match for various Dolphin models
- Simple maintenance with periodic rinsing; no tools required
- Cost-effective alternative to OEM parts with comparable performance
Cons
- May require more frequent rinsing if the pool is heavily soiled or has fine debris
- Only one basket included; some pool owners may need to purchase additional for larger pools
- Not compatible with all Dolphin models; verify compatibility list before purchase
The Fiitzn Ultra Fine Filtration Basket is a replacement filter designed for a wide range of Dolphin robotic pool cleaners, including models like the S50, Active 15, Echo, Nautilus CC, Encore, E10, E20, Proteus DX3, Solo, and Advantage. This part (9991460-R1) is ideal for pool owners seeking an affordable, high-performance alternative to the original filter. It is especially suited for those who want to improve water clarity by trapping fine particles without sacrificing cleaning efficiency.
The standout feature of this basket is its microfiltration technology, which captures small debris while allowing larger particles to pass through. This design prevents the filter from clogging quickly, ensuring consistent suction and longer cleaning cycles. In real-world use, this means less downtime for rinsing and more effective pool maintenance, even in dirty conditions. The basket maintains strong performance over weeks of use before needing a quick rinse.
Build quality is solid thanks to the ABS plastic frame, which resists cracking and deformation under pressure. The filter layer is securely supported, reducing the risk of tearing during operation. Installation is straightforward: it fits exactly like the original part, so no modifications or adapters are needed. Rinsing every 4-6 weeks keeps it working optimally, and with proper care, the basket can last 2-3 years, offering excellent value.
One potential drawback is that in extremely dirty pools, the filter may need more frequent rinsing to maintain flow. Additionally, the package includes only one basket, so owners of larger pools might need to buy a second. Also, while compatibility is broad, it does not cover every Dolphin model, so double-checking the list is wise. These are minor trade-offs for the price and performance.
Overall, the Fiitzn Ultra Fine Filtration Basket delivers on its promise of efficient fine debris capture and durability. It is a smart upgrade or replacement for Dolphin pool cleaner owners who want to keep their water crystal clear without breaking the bank. The combination of microfiltration, sturdy construction, and broad compatibility makes it a reliable choice for routine pool care.
Dimensions: 9.1 x 7.1 x 5.3 inches
Weight: 1 pound
Material: ABS plastic frame with microfiltration mesh
Compatibility: Dolphin models S50, S100, Active 15, Echo, T15, Proteus DX3, E20, Cayman, Escape, Nautilus CC, Encore, E10, Solo, Advantage
Replaces OEM Part: Maytronics 9991460-R1
Maintenance: Rinse every 4-6 weeks; expected lifespan 2-3 years with proper care
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 Nautilus CC Fine Filter
Compatibility with Your Dolphin Model
The most critical factor is whether the filter fits your exact Dolphin cleaner. The Nautilus CC family includes several variants: the original Nautilus CC, Nautilus CC Plus, Nautilus CC Supreme, and others. For instance, filters that list compatibility with part number 9991432-R4 typically work with the Nautilus CC Plus, M200, M400, M500, and more, but are not compatible with the original Nautilus CC. Conversely, the 9991460-R1 basket fits the Nautilus CC (original) and models like E10, S50, and Encore. Always verify the product description against your cleaner’s manual.
If you are unsure about your model, check our complete Dolphin filter compatibility guide for a quick reference.
Filtration Efficiency: Pleated vs. Standard
Ultra-fine filters come in two main styles: pleated cartridges and non-pleated baskets. Pleated filters (like those from Poolzilla, Kerneed, and SUNRRA) offer a larger surface area, trapping microscopic particles while maintaining water flow. Non-pleated baskets (like the Fiitzn 9991460-R1) use a spring system to catch larger debris first, allowing fine particles through to the basket layer. For pools with heavy leaf or organic matter, a basket style can reduce clogging. For maximum clarity, a pleated cartridge is often the better choice.
Durability and Build Quality
Filter panels and baskets are exposed to constant water pressure, chemicals, and physical stress. Look for frames made from heavy-duty ABS plastic, which resists cracking and warping over time. Many premium options, such as the SUNRRA 8-pack and the Kerneed M400 set, promise a lifespan of two to three years with proper care. A sturdy frame also ensures the filter maintains its shape during the cleaning cycle, preventing bypass of unfiltered water.
For a breakdown of genuine vs. aftermarket durability, read our dolphin genuine replacement filters.
Ease of Maintenance and Cleaning
All the filters in this review are washable and reusable. A quick rinse with a garden hose every four to six weeks keeps them performing well. Some models, like the REEPLAR 9991460-r1 basket, include a bottom spring that collects leaves and larger debris, making cleanup straightforward. Others require you to remove and rinse individual pleated panels. Choose a design that fits your comfort level, if you prefer less frequent deep cleaning, a basket system may be more convenient.
For more tips on filter basket selection, visit our best Dolphin filter baskets page.
Final Thoughts
Choosing the right Dolphin Nautilus CC fine filter comes down to your pool’s specific needs and your cleaner’s model. If you own a Nautilus CC Plus, M400, or similar, the SUNRRA Ultra Fine Filters Compatible with Dolphin (8-pack) offer unbeatable value and long-lasting performance. For owners of the original Nautilus CC or smaller models like the E10, the Fiitzn Ultra Fine Filtration Basket Compatible provides a complete drop-in solution that catches both large and fine debris with ease. Whichever you pick, your pool will stay crystal clear all season long.
Related Guides
- Best Pool Robot Filter Basket for Algae in 2026
- Dolphin Ultra Fine Filter Review
- Dolphin Filter Basket Cyber Monday Deals
Frequently Asked Questions
What is the difference between Dolphin Nautilus CC and Nautilus CC Plus filters?
The original Nautilus CC uses a top-loading filter basket (part 9991460-R1), while the Nautilus CC Plus uses side-mounted cartridge panels (part 9991432-R4). They are not interchangeable. Always confirm your model before ordering.
How often should I clean my Dolphin Nautilus CC fine filter?
We recommend rinsing the filter every four to six weeks during the swimming season. If your pool sees heavy use or you notice reduced suction, clean it more frequently. Proper care can extend the filter’s life to two or three years.
Can I use a fine filter from another brand in my Dolphin Nautilus CC?
Yes, many third-party brands like SUNRRA, Kerneed, and Poolzilla produce compatible aftermarket filters that match or exceed OEM quality. Just ensure the part number (9991432-R4 or 9991460-R1) matches your model. These alternatives are often more affordable and perform just as well.
Will an ultra-fine filter reduce water flow in my Dolphin cleaner?
High-quality pleated filters are designed to balance fine filtration with good hydraulic efficiency. Brands like Kerneed and Funmit use dense but well-spaced pleats that capture particles without choking flow. As long as you rinse the filter regularly, you should not notice a significant drop in performance.
For more information on maintaining your Dolphin, check our full replacement filters category.
