advantis Aqua Silk Chlorine-Free Pool Sanitizer - 1/2 gallon Biguanide based pool sanitizer that is used in place of chlorine or bromine for soft, silky water Dosage: 1/2 gallon for every 10,000 gallons of water to establish a sanitizer level of 50 ppm Compatible with Baquacil, Soft Swim and Revacil