Spafrog Frog Serene Mineral Cartridge For Hot Tubs In-Line Or Floating (3 Pack)

These retail for $36.00 for ONE. Selling 3 for $60.00 One FROG Serene Mineral Cartridge for use in FROG Serene (formerly Spa FROG) Mineral Floating System or FROG Serene In-Line System; must be used with the FROG Serene Bromine Cartridge (sold separately). FROG Serene kills bacteria 2 ways with a low level of bromine - up to 50%* - plus FROG Sanitizing Minerals for water that feels more comfortable Unlike chlorine, bromine slowly dissolves in hot water so it’s easier to regulate, has far less odors and is less impacted by pH swings, making sanitizing more effective Each Mineral Cartridge lasts for 4 months, conditioning the water for softness, helping balance pH and absorbing acids – you get ahhmazingly Cleaner, Clearer, Softer water that’s easier to care for. Prefilled Cartridges make for easy no guess, no mess, no stress replacement.