Your pool is finally sparkling after a long winter, but your Dolphin Nautilus CC Plus is leaving behind fine dust and pollen. You check the filter panels and realize they are worn out, clogged, or just not catching the tiny particles. Replacing them with the right fine filters is the only way to restore that crystal-clear finish without extra scrubbing or chemicals. In this guide, we review the top replacement options for the Dolphin Nautilus CC Plus, from ultra-fine pleated panels to durable fine-mesh screens, all designed to keep your robotic cleaner performing at its best. Whether you need a budget-friendly pack or premium longevity, we have you covered. For more options, check our complete guide to Dolphin Nautilus CC replacement filters.
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
Filtration Type: Ultra-Fine vs. Fine Mesh
The first decision you face is whether to go with ultra-fine pleated panels or standard fine mesh screens. Ultra-fine filters, like those from SUNRRA Ultra Fine Filters Compatible with Dolphin, use pleated material that traps smaller particles such as pollen, algae, and fine silt. They are ideal for maintaining pristine water quality during regular use. On the other hand, fine mesh panels, such as the PUREBURG Fine Filter Panels Compatible, are better at catching larger debris like leaves and twigs without clogging quickly. For heavily soiled pools after a storm, start with fine mesh, then switch to ultra-fine for finishing touches. If you are unsure, read our review of ultra-fine filters for more details.
Compatibility with Your Dolphin Model
Not all filters fit all Dolphin models. The Nautilus CC Plus uses part numbers 9991432-R4 (ultra-fine) and 9991433-R4 (fine mesh). Many third-party brands explicitly state compatibility with the Nautilus CC Plus, but double-check that your cleaner is not the older Nautilus CC or Triton models. For example, the Poolzilla Pool Cleaner Ultra-Fine Filters fit the Nautilus CC Plus but not the original Nautilus CC. Always verify the model list before purchase to avoid the hassle of returns.
Pack Size and Value
Replacement filter panels are sold in packs of four, six, or eight. A four-pack is sufficient for a single full set, but buying an eight-pack from a brand like SUNRRA saves you money over time and ensures you have spares on hand. The SUNRRA Ultra Fine Filters 8-Pack offers excellent value for frequent users. If your pool experiences heavy debris, having extra panels lets you rotate them and maintain consistent performance without waiting for replacements to arrive.
Durability and Build Quality
Filter panels must withstand repeated cleaning and water pressure. Look for frames made from heavy-duty ABS plastic, which resists cracking and warping. Brands like Kerneed and Funmit highlight their sturdy ABS frames that last two to three years with proper care. The M400 Ultra Fine Cartridge Filter Replacement from Funmit uses a reinforced ABS frame to prevent deformation during operation. For more insights on filter durability, see our comprehensive replacement filter review.
Final Thoughts
After evaluating the top options for your Dolphin Nautilus CC Plus, we recommend the SUNRRA Ultra Fine Filters Compatible with Dolphin in the eight-pack for those who want long-lasting, ultra-fine filtration at a great value, and the PUREBURG Fine Filter Panels Compatible for tackling larger debris during heavy pool use. Both deliver reliable performance and are compatible with your cleaner, so you can enjoy a sparkling pool without the guesswork. Remember to rinse your filters every four to six weeks to extend their lifespan and keep your pool pristine 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
How often should I replace the fine filters in my Dolphin Nautilus CC Plus?
With regular use and monthly rinsing, ultra-fine filter panels can last two to three years. If you notice reduced suction, cloudy water, or visible wear, it is time to replace them. Inspect the panels every season and replace as needed for best results in 2026.
Can I use fine mesh filters instead of ultra-fine filters?
Yes, but fine mesh filters trap larger debris and are ideal for initial cleanings after winter or storms. For ongoing maintenance and finer particles like algae and pollen, switch to ultra-fine pleated panels. Many users keep both types on hand for different conditions.
Are third-party filters as good as original Maytronics ones?
High-quality third-party brands like SUNRRA, Kerneed, and Funmit offer comparable performance at a lower cost. They use premium materials such as ABS plastic and pleated filter paper that match or exceed OEM specifications. Check customer reviews and compatibility lists to ensure a perfect fit.
How do I clean the Dolphin Nautilus CC Plus filter panels?
Rinse the panels with a garden hose to remove loose debris. For stubborn dirt or oil buildup, soak them in a mild detergent solution for 15 minutes, then rinse thoroughly. Avoid using harsh chemicals or abrasive brushes, as they can damage the filter material. For more maintenance tips, see our filter basket cleaning guide.
