Fast Acting Pool Shock Dissolves Quickly to Give Your Pool a Chlorine Boost. Ideal way to give your pool a quick boost of chlorine. Dissolves quickly so your pool is usable faster after treatment. Use this pool shock for an essential component to your spring opening. Only add directly to your pool (or spa). Consists of 68% calcium hypochlorite. Initial dosage: 1 lb. per 10,000 gallons of water.
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