Pleatco PGF5 Replacement Cartridge for General Foam 5, 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 8-1/16-by-1-3/4-by-1-7/8-inches Made in the USA