SmartChlor™ Cartridges 3-pack refill for the Spa Frog @Ease Floating System. The SmartChlor™ time-release technology maintains a consistent low chlorine level for weeks, up to 75% less. Self-regulating, so It goes to work when the hot tub needs sanitizing. When cartridge is depleted, the system flips over, telling you to replace the empty chlorine cartridge with a new one.

• (3) Chlorine refill cartridges – each lasts up to 4 weeks