4) New Unicel 7CH-322 Replacement Spa Filter Cartridges 32 Sq Ft PAS35-2 FC-0420 Industry's most complete line of replacement filter elements Artesian Spas (Original is 7 7/8" OD and 7 5/8" overall length.) Coleman Spas (100520 and 3301 2109) Master Spas (Replacement for 7" or 8" OD Eco Pur filtration systems; must remove black stand pipe for 8" OD.) ...AND MORE