Spa Frog Serene 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 the spa. Use with companion Frog Bromine Cartridge. Lower your hot tub bromine use up to 50% with FROG Serene minerals. Makes water feel soft and is easier on your skin, swimsuits, and hot tub surfaces than chlorine, and has less chemical odor.
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