The Maytronics Catridge Filter set includes four small ultra fine cartridge filter panels. Filters are for use with specific Maytronics Cleaners including S200, S300, S300i, Active 20, Active 30, Active 30i Prowler 920, Prowler 930, Discovery, Premium, Quantum, Triton PS, Triton PS Plus Maytronics Dolphin Robotic Pool Cleaners
