HQRP 2-pack Submersible Pond Filter/Flat Box Filter Pads for Tetra SF1, FK5, FK6 Coaster HQRP&reg; 2 pack Black and Blue Foam Filter Pads + HQRP&reg; Coaster; Coarse and Fine-mesh foam Pads for removing debris and prevention pump from clogging; The pads are used in SF1 Submersible Pond Flat Box Filter for FK5 / FK6 Filtration Fountain Kits; Measures 9 1/2" x 2 3/8" x 12 1/4"; 100% Compatible with Original filter. 2 weeks DOA replacement warranty!