Pleatco PJAN100 Replacement Cartridge for Jandy Industries CT-100, Waterco Trimline CC-100, 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 29-3/8-by-3-1/16-by-3-1/16-inches Made in the USA