HTH 12 lb. Pool Care Shock Advanced (12-Pack of 1 lb. Shock)

HTH Super Shock. Pool Shock Treatment is the 4-in-1 powerful pool shock designed to boost chlorine levels and kill and prevent bacteria and algae for a clear, healthy pool. Each pound of Super Shock. packs a powerful punch, treating 13,500 Gal. and restoring crystal clarity in just 24-hours. This pool shock is great for all pool types and won't fade your pool liner. Test and apply shock treatment directly to your swimming pool every week to keep free available chlorine levels between 1 and 4 ppm for healthy swimming conditions.