Pleatco PDM25 Replacement Cartridge for Dream Maker Spas, 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 8-1/8-by-1.9-inches Keyed with handle Made in the USA