You rely on your Dolphin E50 robotic pool cleaner to keep your pool spotless, but over time, even the best filters lose their effectiveness. Whether you are dealing with fine sand, tiny algae particles, or pesky debris, upgrading to a high-quality replacement filter can make a world of difference. In this guide, we evaluate the top Dolphin E50 replacement filters on the market for 2026, highlighting options from trusted brands like ULTICOR, Gearwiz, and Funmit. Whether you need a ultra-fine filter basket or a cartridge-style filter, we have you covered. Before diving in, check out our guide on Dolphin E30 ultra-fine filters for more insights on similar models.
Pros
- High-efficiency microfiltration captures fine dirt, sand, and leaves for pristine pool water.
- Works with a wide range of popular Dolphin robot models, reducing the need for multiple filter types.
- Easy to clean and maintain with no special tools required.
- Affordable price compared to manufacturer replacement filters.
- Solid build quality with lightweight yet sturdy plastic construction.
Cons
- Not compatible with Dolphin Nautilus CC Pro or CC Supreme models, limiting its use for newer variants.
- Older versions of Active 10 or S50 may require removal of a plastic piece for proper fit, which could be inconvenient for some users.
- As an aftermarket part, it may not perfectly match OEM quality or warranty coverage.
The Ulticor Ultra Fine Filter Basket is an aftermarket replacement designed specifically for a wide array of Dolphin robotic pool cleaners. It is an ideal choice for pool owners who already own compatible models such as the Dolphin S50, S100, Active 10/15, Echo, T15, T25, Proteus DX3, Saturn, Cayman, Escape, and others. This basket is not intended for the Nautilus CC Pro or Supreme versions, so buyers should verify compatibility before purchasing.
What sets this filter apart is its microfiltration technology, which captures even the tiniest debris particles. In real-world use, this translates to a noticeably cleaner pool with clearer water, as fine dirt, sand, and pollen are effectively trapped. The basket is easy to rinse and clean every four to six weeks, maintaining peak performance without hassle. Users report that it fits snugly and works reliably cycle after cycle.
The design is straightforward: a white, lightweight plastic basket measuring roughly 9x5x7 inches. Build quality feels solid for an aftermarket part, though it may not have the exact finish of an OEM component. The inclusion of installation tips for older Active 10 or S50 units (which may need a small internal plastic piece removed) shows attention to compatibility details. A video guide is available upon request to assist with that adjustment.
Potential drawbacks are mostly centered on fitment limitations. Owners of Nautilus CC Pro or Supreme will need to look elsewhere. Also, the need to modify older robots could be a minor inconvenience for those not comfortable with simple DIY tasks. However, for the vast majority of compatible users, installation is plug-and-play.
Overall, the Ulticor Ultra Fine Filter Basket offers excellent value for money. It delivers superior filtration at a lower price than official replacements, while covering a wide range of popular Dolphin models. If you own one of the listed robots and want to keep your pool sparkling clean without breaking the bank, this filter is a smart buy.
Pros
- Ultra-fine 10-micron filtration for superior water clarity
- Reusable and easy to clean with minimal maintenance
- Durable ABS construction lasts 2-3 years
- Fits multiple Dolphin and compatible pool cleaner models
- Backed by a 1-year warranty
Cons
- Not compatible with Nautilus CC Pro or CC Supreme models
- May require removing a plastic piece in older Active 10 or S50 robots for proper fit
- Zero customer reviews available at launch, so long-term reliability is unverified
The SUNRRA Ultra-Fine Filter Basket is a replacement part designed specifically for a wide range of Dolphin and compatible robotic pool cleaners. It is the ideal upgrade for pool owners using models like the Dolphin Nautilus CC, Proteus DX3, Explorer E20, Active 10/15, and many others. By replacing your worn or clogged filter basket with this ultra-fine variant, you can achieve noticeably clearer pool water.
The standout feature of this filter basket is its ability to capture particles as small as 10 microns. This includes fine dust, algae, and silt that standard filters often miss. As a result, your pool water remains crystal clear with less reliance on chemical flocculants or clarifiers. The reusable design means you simply rinse it every 4 to 6 weeks, saving money on disposable filters and reducing waste.
Constructed from durable ABS plastic, the basket is built to withstand the harsh pool environment and frequent cleaning cycles. SUNRRA claims a lifespan of 2 to 3 years with proper maintenance. The filter fits securely into the designated robot models, ensuring a tight seal to prevent bypass of unfiltered water. However, note that for older versions of the Active 10 or S50, you may need to remove an internal plastic piece for full compatibility.
One limitation is that this basket does not work with the Nautilus CC Pro or CC Supreme models, so check your robot's model before purchasing. Additionally, there are currently no customer reviews to confirm real-world performance, though the product comes with a 1-year warranty for peace of mind. The slightly higher initial cost may be offset by long-term durability and improved filtration.
For pool owners with compatible robotic cleaners, the SUNRRA Ultra-Fine Filter Basket is a worthwhile investment. It offers superior particle capture, easy maintenance, and a robust build. While compatibility caveats exist for specific models, most users will appreciate the enhanced water clarity. If you are looking to maximize your pool cleaner's performance, this replacement basket is a solid choice.
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 Efficiency
The primary job of a replacement filter is to capture fine debris. Look for models that use ultra-fine mesh or microfiltration technology. For instance, the Ulticor Ultra Fine Filter Basket Compatible uses high-quality microfiltration to trap even microscopic particles. A 50-micron rating is excellent for catching sand and algae, while mesh surface filters from brands like Doule King capture particles as small as 0.5mm.
Consider your pool’s specific needs. If you frequently deal with fine silt or algae blooms, an ultra-fine filter basket is a must. For general debris, a standard cartridge filter may suffice. For more details on filtration types, see our guide on Dolphin E30 filter baskets.
Compatibility with Your Dolphin Model
Not all filters are universal. Before purchasing, verify that the filter is compatible with your Dolphin E50. Many products, like the Gearwiz Ultra Fine Filter Basket Compatible, are designed for a wide range of models, including the Active series and Explorer E50. Always double-check the model list in the product description to avoid mismatches. If you own an older E50 version, you may need to remove a plastic piece for proper fit, as noted with some ULTICOR filters.
Mismatched filters can lead to poor performance or damage to your cleaner. For more on compatibility, check out our article on Dolphin E20 ultra-fine filters.
Ease of Cleaning and Durability
Reusable filters save you money and reduce waste. Most replacement filters are washable and designed to last 2-3 years with proper care. For example, the 9991463-R4 Ultra-Fine Filter Panels (Mesh surface) boast reinforced stitching for extended durability. Rinsing your filter every 4-6 weeks is standard, but some models can handle more frequent cleaning without losing integrity. Look for UV-resistant materials that withstand pool chemicals and sunlight.
Filters with a sturdy ABS plastic frame, like those from K Trends, offer added resilience. For more tips on maintenance, explore our guide on Dolphin E20 filter baskets.
Pack Size and Value
Many filters come in multi-packs, offering better value per filter. For instance, the M400 Ultra Fine Cartridge Filter Replacement comes in a 4-pack, ideal for extended use without frequent reordering. However, consider your pool’s size and how often you clean to determine the right pack size. Larger filters may be more expensive upfront but last longer, while smaller packs are convenient for occasional replacements.
For budget-conscious buyers, 4-packs from brands like K Trends or Doule King provide exceptional value. We also recommend checking out our Dolphin E20 replacement filter guide for similar value comparisons.
Final Thoughts
Choosing the right Dolphin E50 replacement filter comes down to your pool’s unique demands and your cleaning routine. For those who prioritize maximum fine debris capture, the Ulticor Ultra Fine Filter Basket Compatible stands out with its premium microfiltration technology and broad compatibility, making it a reliable choice for year-round crystal-clear water. Meanwhile, if you are looking for an economical solution that still delivers strong performance, the K Trends 4 Pack Ultra Fine Cartridge Filters offer exceptional value with four filters in one pack, perfect for maintaining consistent filtration without breaking the bank.
Related Guides
- Best Pool Robot Replacement Brush for Algae in 2026
- Replacements for Sparkling Water in 2026
- WYBOT Replacement Brush Review
Frequently Asked Questions
How often should I replace my Dolphin E50 filter? Most ultra-fine filters last 2-3 years if rinsed every 4-6 weeks. However, heavy usage or debris loads may require replacement sooner. In 2026, many aftermarket options offer multi-packs for convenience.
Can I use any Dolphin filter on my E50? No, compatibility is key. Always verify that the filter fits the E50 model specifically. Some filters like the Ulticor are compatible with many Dolphin models, but others are limited to specific series like Active or Explorer. Double-check the product’s model list before purchasing.
What is the difference between a filter basket and cartridge filter? A filter basket is a rigid container with fine mesh that fits into the cleaner’s body, while cartridge filters use pleated paper or fabric in a plastic frame. Both capture fine debris, but baskets are easier to clean, while cartridges offer deeper filtration.
Can I clean my Dolphin E50 filter in a dishwasher? It is not recommended. Dishwashers can damage the filter media. Instead, use a garden hose to rinse off debris, and use a soft brush if needed. For more tips, see our article on Dolphin E30 ultra-fine filters.
