Pleatco PA81-PAK4 Replacement Cartridge for Hayward SwimClear C-3025, Pack of 4 Cartridges 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 19-3/4-by-3-by-3-inches Made in the USA 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 19-3/4-by-3-by-3-inches. Material area: 325 square feet Made in the USA