Gallon, 6x1, Pool Essentials 10% Chlorinizor Strength, Liquid Chlorine. Use to disinfect swimming pool water and prevent algae growth in your pool. Can also be used for other disinfection and sterilization applications. Follow the instructions on the label, since this product is a registered pesticide, it is a violation of the law to use this pesticide in ways not stated on the label. Chlorinating solution is basically double strength bleach. Active ingredient-Sodium Hypochlorite.