Overview Reviews Similar Products Product Description Spa Frog 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. Product Videos Custom Field Product Reviews Find Similar Products by Category Recommended Quick view Caldera Spas Spa Frog Mineral Cartridge For 2008 To Current - 74362 $49.95 Add to Cart Quick view Spa frog cartridge holder for inline spa frog system - 990-0775 $44.95 Add to Cart Quick view Spa Frog Cartridge Kit 4 Pack $81.20