HTH Pool Care Shock 13 oz. (was formerly HTH Shock Treatment). HTH Pool Care 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.
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