HTH Super Shock! Pool Shock Treatment is the 4-in-1 powerful pool shock designed to boost chlorine levels and kill and prevent bacteria and algae for a clear, healthy pool. Each pound of Super Shock! packs a powerful punch, treating 13,500 gallons and restoring crystal clarity in just 24 hours. This pool shock is great for all pool types and won?t fade your pool liner. Test and apply shock treatment directly to your swimming pool every week to keep free available chlorine levels between 1 and 4ppm for healthy swimming conditions. About the Brand: HTH was developed with the consumer in mind, offering products that are both economical and powerful enough for the toughest jobs. Within HTH?s wide selection of products, we offer everything you need for your pool, from algaecides and deposit control formulas to non-chlorine shock treatments, powerful surface cleaners, clarifiers, enzyme-based cleaners, and more. If you like using HTH, check out some of the other similar brands from our parent company, Sigura. With brands like Applied Biochemists, Leisure Time, GLB, Spa Selections, and PooLife, Sigura has a long heritage and more than a century of experience in developing innovative water treatment solutions for use in pools, lakes, ponds, hot tubs, and more. At Sigura, we have an unparalleled passion, pride, and commitment to delivering superior water treatments that improve the environment and enhance the security, health, and safety of the global communities we serve. With our track record of innovation and simple, intuitive solutions that anticipate needs, Sigura customers feel more secure as they enjoy their pools, spas, ponds, and lakes.