King Technology 01143258 Ease Floating SmartChlor Cartridges - Set of 3

Low-chlorine spa sanitizing cartridge maintains a consistent 0.5 1.0 ppm free chlorine level at all times Shock only once a month and use up to 75% less chlorine Floats in spa water and flips over when empty, indicating the SmartChlor cartridge needs replacing Lasts 3-4 weeks in spas up to 600 gallons Designed for use with Frog ease Mineral System - Mineral Cartridge not included