by HTH
Buy new: $22.99
2 used & new from $22.99
(Visit the Best Sellers in Chlorine list for authoritative information on this product's current rank.)
FAST ACTING AND POWERFUL!
15% Stronger than regular HTH Shock and contains 53% available chlorine, yet safe enough to swim after treatment. This fast dissolving formula is ideal for weekly shock treatments and killing algae. Calcium Hypochlorite. Dosage: 1 lb. per 12,000 gallons.
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