Pool Filter 3-Pack, Replaces Unicel C-6430, Pleatco PWK30, Filbur FC-3915 Filter Cartridge for Swimming Pool and Spa Replacement Filter Cartridge for Unicel C-6430-3, Filbur FC-3915 and Pleatco PWK30 Replaces Pleatco PWK30 Replaces Filbur FC-3915