In The Swim Chlorine-Free Pool Swimming Pool Shock - 12 x 1 Pound Bags Powerful oxidizing agent burns off dead chlorine cells and provides higher free chlorine levels Chlorine-Free shock oxidizes and eliminates algae growth and harmful bacteria Ideal for bromine sanitized pools, weekly maintenance, and will not effect other chemical levels Contains 38% Potassium Monopersulfate and is safe to swim immediately after use Dosage: 1-Pound per 10,000 gallons