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Shock, which is a common type of pool chemicals, is usually sold in one pound bags. For regular shock, which has 65% available chlorine, one pound is needed for every 10,000 gallons of water in your pool. "Burst" shock, which has 56% available chlorine, has a ratio of one pound to 12,000 gallons of water. If you don't know how many gallons your pool holds, use this simple pool volume calculator. 
How Much Bleach to Shock Pool?