HTH Sock It contains 45% available chlorine making it a very powerful yet safe chlorine shock treatment, swim immediately after use! Controls algae, bacteria and other organic contaminants. Use HTH shock on a weekly basis to prevent algae growth. Dosage = 1 to 2 pounds per 11,500 gallons. Calcium Hypochlorite. NOTE: This item cannot be shipped to Alaska or Hawaii. If your shipping address is i
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