SmartChlor Replacement Cartridges work with the FROG @ease Floating System. When SmartChlor needs to be replaced, the system flips over. Simply snap the spent Cartridge off and put the new one on – it’s that easy. Never touch chlorine again – no mess, no stress, no guess! SmartChlor Cartridges last up to 3 to 4 weeks depending upon hot tub size and use. FROG @ease delivers easy, worry free water maintenance with far less odors and no faded swimsuits. FROG @ease knows when more sanitizing power is needed and automatically delivers it. Plus, FROG @ease uses up to 75% less chlorine* and kills bacteria 2 ways with FROG Sanitizing Minerals and a low level of chlorine - that gives you peace of mind. Using SmartChlor Technology, FROG @ease maintains a consistent, low chlorine level. Ideal for 600 gallon hot tubs. *Compared to the minimum ANSI recommended chlorine level of 2.0 ppm. for a hot tub