Spa Frog @ease Replacement SmartChlor Chlorine Cartridge – 3 Pack

Low-chlorine SmartChlor refills maintain a consistent 0.5 – 1.0 ppm free chlorine level at all times Each cartridge lasts 3-4 weeks in spas up to 600 gallons Shock only once a month and use up to 75% less chlorine Designed for use with Spa Frog @ease Mineral System—Mineral Cartridge not included Clever System floats in spa water and flips over when it’s time to change cartridges.