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.