In The Swim Lithium Pool Shock 12 lbs
Completely soluble premium granular chlorine produces excellent chlorination.  This pool shock dissolves immediately and leaves no cloudy residue and will not bleach your liner.  Great for hot days and heavy bather loads.  Compare to Burn Out 35, Fast Shock and Super Chlorinator 35.  Lithium Hypochlorite.Dosage:1 lb. per 10,000 gallons.