In The Swim Chlorine Pool Shock - 12 X 1 lb. bags<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>12 x 1 pound bags</li><li>Powerful and effective chlorinated shock treatment</li><li>Provides a quick chlorine boost when fast-action is needed</li><li>Contains 68% Calcium Hypochlorite for fast-acting oxidation， Dosage: 1 lb. per 10，000 gallons</li><li>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.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51m1KeMkJ1L.jpg" noproxy>