Pleatco PFF25 Replacement Cartridge for Freeflow Lagas, 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 6-5/8-by-2-1/8-1.9-inches Keye Made in the USA