4 LB conditioner & stabilizer for swimming pools. This chlorine stabilizer will come in flake/powder form. 3 LB per 10,000 gallons to raise 36 PPM. This is 100% cyanuric acid to help prevent chlorine loss due to UV radiation. For use in all newly filled pools and in season for pools that use non-stabilized chlorine and chlorine generators, nu-clo Conditioner & Stabilizer is a slow dissolving granular that is applied by mixing in a bucket with water and pouring slowly through the skimmer.