Your Dolphin Nautilus CC Plus pool cleaner works hard to keep your water clear, but its filter cartridges need regular replacement to maintain peak performance. Choosing the right replacement ensures your pool stays spotless and your robot runs efficiently. In this guide, we review the top Dolphin Nautilus CC Plus filter cartridges for 2026 to help you find the perfect fit. For more options, check out our Dolphin Nautilus CC replacement filters 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
Compatibility with Your Dolphin Model
Not all filters fit every Dolphin model. The Nautilus CC Plus, M400, M500, and M200 share the same cartridge dimensions, but older Nautilus CC and other models like Triton PS use different parts. Always verify that the replacement explicitly lists your cleaner model. The products reviewed here are designed for Nautilus CC Plus and most M-series robots. For a full list of compatible models, see our Dolphin Nautilus CC ultra fine filter guide.
Filtration Type: Spring vs. Ultra Fine
Spring filter cartridges (like the Kerneed set) use a screen material that traps larger debris such as leaves and twigs. They are ideal for the first few cleanings of a dirty pool. Ultra fine pleated filters (like SUNRRA and Funmit) capture smaller particles such as sand, hair, and fine silt, leaving the water crystal clear. Many pool owners keep both types on hand for different cleaning stages.
Durability and Build Quality
All five products feature ABS plastic frames that resist cracking and warping. The pleated filter paper in ultra fine models is reinforced to maintain its shape under water pressure. With proper rinsing every 4 to 6 weeks, these cartridges can last 2 to 3 years. Look for sturdy construction that won’t deform during operation.
Pack Size and Value
Filters are sold in packs of 4 or 8. An 8-pack offers better long-term value, especially if you clean your pool frequently. Smaller packs are convenient for testing a new brand. Consider your usage frequency and whether you prefer to replace all cartridges at once or rotate them. For more buying tips, visit our Replacement Filters category.
Final Thoughts
Whether you need heavy-duty spring filters for initial debris removal or ultra fine pleated filters for polished clarity, the options above cover every need. For those who want maximum fine filtration, the SUNRRA Ultra Fine Filters Compatible with Dolphin in the 8-pack offer excellent value and consistent performance. If your pool tends to accumulate large debris first, the Spring Filter Cartridges Work with Dolphin from Kerneed are a smart choice for the initial cleanings. Both are reliable, durable, and designed to keep your Dolphin Nautilus CC Plus running at its best.
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Frequently Asked Questions
How often should I replace Dolphin Nautilus CC Plus filter cartridges?
With regular rinsing every 4 to 6 weeks, these cartridges can last 2 to 3 years. Replace them when the filter material becomes frayed, torn, or no longer traps debris effectively. In heavy-use seasons, you may need to replace them more frequently.
Are these filters compatible with the Dolphin Nautilus CC (non-plus)?
No. The Nautilus CC uses different cartridge dimensions (part # 9991463-R4). The filters in this review are designed for Nautilus CC Plus, M400, M500, and similar models. Always check your robot’s model number before purchasing.
What is the difference between spring and ultra fine filters?
Spring filters have a screen-like mesh that captures large debris such as leaves and twigs without clogging quickly. Ultra fine pleated filters trap smaller particles like sand, hair, and fine dirt for a crystal clear finish. Many pool owners use spring filters for initial cleanings and ultra fine for ongoing maintenance.
How do I clean the filter cartridges?
Rinse the cartridges with a garden hose every 4 to 6 weeks. For stubborn debris, use a gentle brush. Avoid harsh chemicals or high-pressure washers that can damage the filter material. Let them dry completely before reinstalling. For more maintenance tips, see our best AIPER pool cleaner guide for similar care advice.
