In The Swim Chlorine Pool Shock - 12 X 1 lb. bags 12 x 1 pound bags Powerful and effective chlorinated shock treatment Provides a quick chlorine boost when fast-action is needed Contains 68% Calcium Hypochlorite for fast-acting oxidation, Dosage: 1 lb. per 10,000 gallons Special Shipping Information: This product may not be available for 1 or 2 day shipping due to federal regulations that require it to ship via ground ship methods only. This product can only be shipped within the 48 contiguous states.