Frog @ease Floating Sanitizing SystemFrog @ease Floating Sanitizing System features a unique self regulating chlorine and Frog minerals to give you a simple solution to hot tub care. This system uses up to 75% less chlorine than traditional hot tub systems. The SmartChlor cartridge lasts up to 4 weeks and the mineral cartridge lasts up to 4 months. Another great feature is that you only need to shock once per month.