Spa Frog Mineral Cartridge refill for use in either the Spa Frog Floating System, or for users of the Spa Frog Inline System which is factory-installed in their spas. Use with companion Frog Bromine Cartridge.
Install with Spa Frog Floating System by twisting into bottom of floater. On factory installed spas install as manufacture recommends.
Mineral cartridge should be replaced every 4 months when you drain and fill your spa.
Product notes: The Spa Frog inline system is factory-installed on selected newer spa models including: Emerald Spas, Coast Spas, Saratoga Spas, Caldera Spas, Marquis Spas, Morgan Spas, Watkins Hot Spot, Pacific Hot Tubs, Catalina Spas, Cal Spas, and Leisure Bay spas.