The FROG @ease Floating Sanitizing System combines sanitizing minerals and SmartChlor Technology to kill bacteria two ways with up to 75% less chlorine.* The result is Fresh Mineral Water that?s silky soft with far less odors and the easiest water to maintain because it?s self-regulating. It knows when more sanitizing power is needed and automatically delivers it. You sit back and relax until FROG @ease flips over. Then simply replace the SmartChlor Cartridge for another 3-4 weeks of worry-free hot tub enjoyment! With FROG @ease, there's no constant monitoring or mixing chemicals. You shock only once a month and it's easy on hot tub surfaces with no smelly odors. After 4 months or when draining and refilling the hot tub, it's time for a new FROG @ease Floating System kit that includes FROG Jump Start shock and FROG @ease Test Strips. *Compared to the minimum ANSI recommended chlorine level of 2.0 ppm for a hot tub.