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HTH Pool Care Shock for Swimming Pools, Boosts Chlorine Levels, Cal Hypo Formula, Pool s, 5.5 lbs HTH® Shock is the original swimming pool shock designed to boost chlorine levels and kill bacteria and algae for a clean, clear pool. Traditional chlorine products contain cyanuric (CYA). When too much CYA builds up, it can cause over-stabilization or chlorine lock and cloud your water. The fast-acting, fast-dissolving Cal Hypo based formula in HTH® Shock provides chlorination without adding extra CYA for a beautiful sparkle all season. This pool shock is great for all pool types and won't fade your pool liner. How To Use HTH® Shock Follow the on-pack instructions according to your pool size to add HTH® Shock directly to swimming pool water or skimmer. Make sure to use a clean, dry scoop. For best results, apply HTH® Shock as part of your weekly pool care routine to keep free available chlorine levels between 1 and 4 ppm. * Multi-use pool shock with Cal Hypo * Use weekly to solve 90% of pool water problems within 24 hours * Fast-acting and fast-dissolving * Visibly brilliant sparkle * This Cal Hypo based formula sanitizes without adding cyanuric (CYA) to prevent over-stabilization or chlorine lock. * This product is great for all pool types including vinyl-lined pools and salt water systems. About HTH® Pool Care HTH® was developed with the pool owner in mind. We know that maintaining your pool water can be a lot of work. That’s why we're here every step of the way, helping you clear the uncertainty from pool care. With economical, easy-to-use solutions, HTH® is designed to work hard so you're prepared to tackle whatever life throws in your pool. From balancing your water to treating green water, we offer a full line of products to keep your pool water y and your swimmers happy. Shock treat, sanitize, clarify and help prevent bacteria and algae in your swimming pool water, all with this convenient, easy-to-use pool . You’re all clear with HTH® For best results, use with HTH® 6-Way Test Strips to test and balance your swimming pool water twice weekly.