Frog Serene ( Spa Frog ) replacement Bromine Cartridge refill for use in a Frog Serene Floating System or the Frog In-Line Sanitizing System which is factory installed in the hot tub and is used in combination with a Frog Serene replacement Mineral Cartridge.
The Spa Frog Floating System transforms your spa into the perfect environment for a soothing relaxation with up to 50% less bromine than standard bromine hot tubs.
