Replacement cartridges are for use in either the Spa Frog Floating System or for users of the Spa Frog In-line System factory-installed in their spas. Product notes: Replace the mineral cartridge every 4 months when you drain and refill your spa. The bromine cartridge will last 2-4 weeks depending on use. 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.
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