The Robelle Swimming Pool Winter Kit helps keep clean, covered pool water clear and odor free. Contains Winter Shock, Winter Clear and Anti-Stain Control. Winter Shock is a 100-percent soluble, non-chlorine pool water winter shock treatment. Winter Clear keeps water clear all winter. Anti-Stain Control is a stain and scale inhibitor that 'ties up' metals and inactivate scale-forming carbonates in the pool water. Includes complete winterizing instructions. The 15,000 Gallon kit contains 2 lbs. of Robelle Winter Shock, 1 qt. of Robelle Winter Clear and 1 qt. of Robelle Anti-Stain Control. The 30,000 Gallon kit contains 4 lbs. of Robelle Winter Shock, 2 qts. of Robelle Winter Clear and 2 qts. of Robelle Anti-Stain Control.