Compatible Models Dolphin robotic pool cleaners models: Active 20, Active 30, Active 30i, Active 40, Active 60, Advantage Ultra, Discovery (new), Explorer E30, Explorer E50, Explorer E70, M600, Mercury, Premium, Proteus DX4, Proteus DX5i, Prowler 920, Prowler 930, Prowler 930W, Quantum, S200, S300, S300i, S400, T35, T45, T55i, Triton PS, Triton PS Plus, Warrior SE, Warrior SI. Effective Cleaning The 9991467-R4 Ultra Fine Filter is an essential accessory for your Dolphin Robotic Pool Cleaner, ensuring thorough cleaning of your pool by trapping microscopic debris. Ultra-Fine Filtration This 9991467-R4 pool cleaner filter captures the finest particles, including dead algae, sand, silt, and other small debris that can make the pool water turbid, maintaining clear water and a pristine swimming environment. Easy Maintenance Easily remove this 9991467-R4 pool cleaner filter for cleaning and replacement, ensuring optimal performance of your robot pool cleaner. Use scenarios After heavy rainfall or windy days, fine sediment and debris can accumulate in the pool; use the ultra fine filter to trap the particles and help keep water clear. During algae remediation or when water is cloudy, the filter’s fine filtration supports faster restoration of clarity. In pools with nearby construction, fine sand or pollen can enter the water; this filter helps maintain pristine conditions by trapping those small contaminants.