Amazon [amazon.com] has
13.3-Oz HTH Pool Care Shock (Treats 12,500 Gallons) for
$3.97. Shipping is free w/ Prime or on $35+.
Product Description from Amazon:
- 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.
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