1. Compatible ModelsCompatible with Dolphin robotic pool cleaners models: Active 20, Active 30, Active 30i, Active 40, Active 60, Advantage Ultra, Discovery (), 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. 2. Effective CleaningThe 9991467R4 Ultra Fine Filter is an essential accessory for your Dolphin Robotic Pool Cleaner, ensuring thorough cleaning of your pool by trapping microscopic debris. 3. UltraFine FiltrationThis 9991467R4 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. 4. Easy MaintenanceEasily remove this 9991467R4 pool cleaner filter for cleaning and replacement, ensuring optimal performance of your robot pool cleaner.