Pleatco PAT50 Replacement Cartridge for Jacuzzi Leisure/Atlantic Pools, Skim Filter 50-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 13-1/4-by-1-7/8-inches with handle Made in the USA