HTH Pool Shock Treatments (6 Packs)

• Contains HTH 52040 Swimming Pool Care Shock Ultra (6 packs) to increase chlorine levels, prevent bacteria and algae, and HTH 52037 Swimming Pool Care Shock Advanced (1 pack) to kill bacteria and algae. Restores crystal clear water and solves 90% of pool problems within 24 hours when used weekly (applies to both products). Compatible with all pool types including vinyl-lined pools and saltwater systems (applies to both products). Cal Hypo based formulas provide chlorination without adding extra cyanuric acid (CYA) to prevent overstabilization or chlorine lock (applies to both products). Built-in blue indicator lets you know HTH 52040 Swimming Pool Care Shock Ultra is working (applies only to HTH 52040).