Pool Care Shock, 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 acid (CYA). When too much CYA builds up, it can cause overstabilization 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. Follow the on-pack instructions according to your pool size to add HTH Shock directly to swimming pool water or skimmer. 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.

• Shock treat, sanitize, clarify and help prevent bacteria and algae in your swimming pool water, all with this convenient, easy-to-use product.
• 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 acid (CYA) to prevent overstabilization or chlorine lock.
• Compatible with all swimming pools
• This product is great for all pool types including vinyl-lined pools and salt water systems.
• This Cal Hypo based formula sanitizes without adding cyanuric acid (CYA) to prevent overstabilization or chlorine lock
• For best results, use with HTH 6-Way Test Strips to test and balance your swimming pool water twice weekly.