• 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.