Spa Frog Cartridge Refill Kit

(3)Yellow-bromine cartridges and (1)Blue-mineral cartridge combine in a floating dispenser to give any spa crystal clear water with a silky feel. The SPA FROG Bromine Cartridge and Mineral Cartridge snaps easily into reduces the need for bromine by up to 50%. Replace the bromine cartridge every 2 to 4 weeks depending on use.