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For Pools With Moderate Daily Use: Add Shoxidizer™ shock oxidizer weekly at a dose of 1 pound per 10,000 gallons of pool water.Each pound of this product will raise the free chlorine concentration by 1 ppm (parts per million) in 10,000 gallons of pool water. More frequent and/or heavier doses may be required during periods of heavy use or following heavy rains or high winds. For Pool Opening or Closing: Add Shoxidizer™ shock oxidizer at a dose of 2 pounds per 10,000 gallons of pool water. This dose will provide sufficient oxidizer to eliminate most of the contaminants that accumulate in pool water, and will immediately raise the free chlorine concentration by 2ppm (parts per million) in 10,000 gallons of pool water. Reentry is prohibited above levels of 4 ppm due to risk of bodily injury.