Pleatco PJ50-4 Replacement Cartridge for Jacuzzi CFR/CFT 50, 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 10-by-5-7/8-by-6-inches Made in the USA