45 Square Foot top load. Replacement for: American Spas; Catalina Spas; Charisma Spas; Clearwater Spas; Dakota Spas; Leisure Bay Spas; Millennium Spas; Phoenix Spas (Note: Two 50 Square Foot cartridges required (used side-by-side).); Rec Warehouse 378902; Sunbelt Spas; Superior Spas; Thermo Spas of Connecticut; Unicel 45 Square Foot front access; Waterway Plastics 817-0050; Aber Hot Tubs (Canada) 03FIL1400; Custom Molded Products 25252; Custom Molded Products 25252 (Note: Two 50 Square Foot cartridges required (used side-by-side).); Hawkeye Spas; Viking Spas ; Bullfrog Spas; Vita Spas PWW 50; Waterway Plastics 817-0050 (Note: Two 50 Square Foot cartridges required (used side-by-side).); Sunbelt Spas (Note: Two 50 Square Foot cartridges required (used side-by-side).); Can spa Mfg. (Canada) (Note: Two 50 Square Foot cartridges required (side-by-side).); Dynasty Spas; Santa Barbara Spas; Santa Barbara Spas (Note: Two 50 Square Foot cartridges required.); Belize Spas (Note: Two 50 Square Foot cartridges required (used side-by-side).); Haven Spas (Note: Two 50 Square Foot cartridges required (used side-by-side).); Phoenix Spas; Apollo Spas (Note: Two 50 Square Foot cartridges required (used side-by-side).); H2O Spas (Note: Two 50 Square Foot cartridges required (used side-by-side).); Gulf Coast Spas; Islander Spas; Tuff Spa; Blue Pacific Spas; Infinity Spas - TN; Arcadia Spas; Spas Direct; Atera Spas (Four Seasons Home Resort Products); Sunrise Spas; Master Spas (Note: For use in Master Spas swim spas.)
