Rx Clear Mega Shock | 73% Calcium Hypochlorite | 1 lb per bag | 24-Bag Pack
WORKS BEST AT NIGHT – Maximize performance by adding this shock to your pool at night. Wait to swim 8 to 10 hours after you start the application. MIX BEFORE YOU FIX – Add this granular powder to a bucket of water before you begin dissolving it in your pool.