Pleatco Replacement Cartridge for Advanced/LA Spas, Gatsby Spas, Spa Manufactures, Pleatco skim flter, Threaded 25-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 9-3/4-by-1.9-inches Keyed with handle Made in the USA