Serene Mineral Cartridge

Frog Frog Mineral Cartridge refill for use in either the Frog Serene Floating System, or for users of the Frog Serene Inline System which is factory-installed in the spa. Use with companion Frog Serene Bromine Cartridge.

Replace the FROG Serene Mineral Cartridge after 4 months or when draining and refilling the hot tub with fresh water.