- 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.