Unicel 6CH-940 replacement filter cartridge can bear the top load of 45 sq. ft and most suitable for Dakota Spas, Vita Spas, Phoenix Spas, Millennium Spas, Pacific Spas by Aber (Canada), Thermo Spas of Connecticut, Viking Spas, Waterway Plastics, Leisure bay mfg, Sunbelt Spas, Santa Barbara Spas, Superior Spas, DM Industries, Clearwater Spas, Gulf Coast Spas, Custom Molded Products, Caribbean spas, Bullfrog Spas, Catalina, Charisma Spas, Custom Molded Products, Dynasty Spas, Barefoot Spas, Apollo Spas, Rec Warehouse, Canspa Mfg. (Canada), Blue Pacific, Tuff Spa, Atera Spas (Four Seasons Home Re, Belize Spas, Aber Hot Tubs (Canada), American Spas, H2O Spas. Haven Spas, Infinity Spas -TN, Islander Spas, Leisure Bay Spas, Hawkeye Spas. With its semi circular handle on its top while 1.5" SAE at its bottom. This replacement filter cartridge is 8 1/4" long and 6" wide. Other details include Unicel 6CH-940, OEM 25252, Filbur FC-0359 and Pleatco PWW50.