In The Swim Super Pool Shock Swimming Pool Sanitizer - Fast Dissolving, Non-Stabilized - 70% Available Chlorine - 12 x 1 Pound Bags;

STRONGEST START-UP AND ALGAE-KILLING POOL SHOCK!

Powerful, fast dissolving, chlorinated shock treatment is ideal for messy Spring clean-ups and stubborn algae blooms in swimming pools. Add the recommended dosage of this product during evening hours while the filter pump is running. When adding this product to your pool, broadcast the product evenly over a wide area in the deepest part of the pool. Use entire contents when opened. If any granules settle to the bottom of the pool, use brush to disperse. 73% Calcium Hypochlorite. Handy 1 pound bags!Dosage:1 lb. per 10,000 gallons.