Serene Mineral Cartridge Light Blue

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. Light Blue cartridge.

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