Arch Chemical HTH 91913 Winterizing Pool Closing Kit
The HTH 3-1/4-pound Winterizing Kit includes One 2-pound HTH Winterizing Pool Closing Shock To Destroy Organic Contaminants. The One-pound HTH Winterizing Stain and Scale Control Will Control Metals In Water. The one 4-ounce HTH Winterizing Algae Control To Prevent Algae Growth. Active Ingredient-Calcium Hypochlorite 40-55-percent.