Certikin Chlorine Reducer 10kg is a fast acting, cost effective agent for reducing Chlorine level in a swimming pool. Contains Sodium Thiosulphate Pentahydrate. Application:Prior to adding Chlorine Reducer to the pool, the granules should be dissolved in a bucket using warm water. Add the Chlorine Reducer to the pool around the area of the water inlet. Allow the water to turn over in the pool at least twice before testing for new Chlorine levels.\n