Pleatco PLBS75 Replacement Cartridge for Rainbow, Waterway, Leisure Bay, S2/G2 Spa 75-Square-Foot, 1 Cartridge Replacement filter for pool and spa cleaning systems 50% open ABS free flow cores maximize water flow through REEMAY filter media Antimicrobial end caps resist chlorine degradation and provide support to filter material for a longer life span 14-3/4-by-2-1/8-by-2-1/8-inches Made in the USA