Controls bacteria and algae in spa water.
At Start up balance your water. Add 1.2 ounces to 500 gallons of water to provide 10 ppm free chlorine do not enter spa until free chlorine falls to 3-5 ppm ..
With Balanced water add .4-.6 ounces per 500 gallons as needed to maintain a 3-5 ppm free chlorine reading as tested with a test kit or test strips. Test prior to entering the spa with each use.