When your Dolphin S300 starts leaving debris behind, it’s often the filter that needs attention. Over time, filter panels lose their ability to trap fine particles, reducing your robotic pool cleaner’s efficiency. Choosing the right replacement restores sparkling water without breaking your budget. In this guide, we review the top Dolphin S300 replacement filters for 2026, from ultra-fine panels to complete filter baskets. Whether you need a quick swap or a long-term upgrade, we’ll help you find the perfect match. For a closer look at similar replacements, check out our dolphin E30 ultra fine filter.
Pros
- Ultra-fine filtration traps even tiny particles for superior water clarity.
- Easy numbered installation system reduces setup time and guesswork.
- Washable and reusable design offers long-term value and eco-friendliness.
- Broad compatibility with many Dolphin and Maytronics robotic pool cleaner models.
- Sturdy build quality withstands regular use and cleaning without tearing.
Cons
- May require more frequent cleaning than standard filters due to ultra-fine mesh trapping more debris.
- Not compatible with all Dolphin models; double-check compatibility before purchase.
- Some users may find the initial fit slightly tight on certain cleaner baskets.
The Henkgo ultra-fine filter panels are a direct replacement for the OEM part 9991467-R4, designed specifically for Dolphin robotic pool cleaners. These pleated cartridge filters are ideal for pool owners who want to maintain sparkling water without frequent skimming. They fit a wide range of models including the S200, Active 20, Proteus DX4, M600, and many more, making them a versatile upgrade for most Dolphin owners.
Standout features include the ultra-fine pleated material that captures sand, gravel, leaves, and even microscopic debris. In real-world use, these filters dramatically improve water clarity compared to standard mesh filters. The numbered panels (1-4) simplify installation: remove in order and replace in reverse, so even first-time users can swap them in minutes. The filters are also washable with a garden hose, retaining their shape and effectiveness after repeated cleanings.
Build quality is reassuringly sturdy. The pleated material holds up well under water pressure and regular cleaning. Each panel measures 9 x 8 x 2.1 inches and weighs just over a pound, making them lightweight yet durable. The white color blends inconspicuously into most pool cleaner baskets. Compatibility is extensive, covering over 25 Dolphin and Maytronics models, which adds significant value for households with multiple cleaners or future upgrades.
One potential drawback is that the ultra-fine mesh may clog faster than coarser filters, especially in heavily debris-laden pools. This means more frequent cleaning sessions, but the ease of rinsing offsets this inconvenience. Additionally, while compatibility is broad, it is not universal, so buyers should verify their specific model before ordering. The initial fit on some cleaner baskets might feel snug, but this ensures a secure seal.
Overall, the Henkgo ultra-fine filter panels offer an excellent balance of performance, durability, and affordability. They deliver professional-grade filtration at a fraction of the OEM cost. For Dolphin pool cleaner owners seeking clearer water and less maintenance, these filters are a smart investment. The simple installation and reusable design make them a practical choice for any pool season.
Buying Guide
Compatibility with Your Dolphin S300
Not every filter fits every Dolphin model. The S300, S300i, and related units like the Active 20 or Triton PS require specific part numbers. Most replacements in this roundup match the 9991467-R4 (ultra fine panels) or 9991458-R1 (filter basket). Always verify your cleaner’s model before ordering. The Dolphin E30 Filter Basket guide also highlights compatible options if you own a similar unit.
Filtration Efficiency
Ultra-fine pleated panels capture particles as small as sand grains and fine silt. Products like the 9991467-R4 Ultra Fine Filter Panels from Qagea use dense fabric that traps debris without clogging quickly. Mesh-surface variants, such as the 9991463-R4 from Doule King, offer a slightly different feel and are confirmed to grab debris down to roughly 0.5 mm. For heavy leaf loads, a thicker pleated design may last longer between cleanings.
Durability and Build Quality
Filter panels face constant water pressure and sharp debris. Look for reinforced stitching and a sturdy plastic frame. Gearwiz and Galloparts models use microfiltration material that holds shape after repeated washes. The Gearwiz Ultra Fine Filter Basket is built with a solid ABS frame that resists warping. For a budget-friendly option, Hihitomorrow’s 9991467-R4 panels still deliver reliable performance with quality non-woven cotton layers.
Ease of Cleaning and Replacement
All filters here are washable and reusable. Most feature numbered panels (1 through 4) that pop out easily from the basket. Simply rinse with a garden hose to remove trapped dirt. The CLLOMAGY and Henkgo sets follow the same numbered system, making swap-out straightforward. Rinsing every four to six weeks keeps performance high. For more tips, see our Dolphin E20 Ultra Fine Filter guide.
Final Thoughts
After evaluating all eight products, two stand out for different needs. For best overall value and filtration, the 9991467-R4 Ultra Fine Filter Panels from Qagea offer a stellar balance of compatibility, ease of use, and proven performance. If you prefer a complete filter basket that includes the frame, the Gearwiz Ultra Fine Filter Basket is a durable choice that simplifies replacement even further. Both options will keep your Dolphin S300 humming through the swimming season.
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 Dolphin S300 filter panels?
With regular cleaning every few weeks, panels typically last one to two seasons. Replace them when you notice reduced water flow or visible wear. We recommend checking them before each swimming season in 2026.
Can I use a filter basket from a different Dolphin model?
It depends on the basket dimensions. The 9991458-R1 basket fits the S300 and many other Dolphin models. Confirm your cleaner’s model number in the compatibility list. For related options, see the Dolphin E20 Filter Basket guide.
Are mesh surface filters better than pleated ones?
Both work well. Pleated filters offer more surface area and trap fine silt, while mesh surfaces are easier to rinse and handle larger debris. Your choice depends on your pool’s typical contaminants.
How do I install new filter panels in my Dolphin S300?
Open the filter lid, remove the basket, and press out old panels from the back. Insert new panels in reverse order (4 to 1) to avoid bending the tabs. Most sets include numbered panels for easy guidance.
