This product forms a thin layer of protection on the surface of your pool. When used bi-weekly, this product will prevent excessive water evaporation, minimize heat loss and reduce the amount of pool chemicals needed to maintain your pool. Shake bottle before use. With the filtration system on, pour 4 oz. per 15,000 gallons of pool water in front of the jets at the deep end of the pool, or into the skimmer. Run the filtration system daily. Repeat this dosage every 2 weeks, for maximum effect.