Helps keep clean, covered pool water clear and odor-free. For pools up to 20,000 gallons. Contains: 1 qt. Summer & Winter Multi-Purpose Algaecide, 1 qt. Winter Stain & Scale Control, and 4 lb. Oxidizing Shock & Swim.

Product Features

• Includes the chemicals you need to close your pool, protect your pool this winter, and yield the most stress-free spring opening you’ve ever had
• The Summer and Winter Multi-Purpose Algaecide will prevent algae growth during the winter months
• The Winter Stain & Scale Control will prevent stain and scale while the pool is closed
• Oxidizing Shock and Swim is the highest strength non-chlorine oxidizing pool shock – effective at eliminating organic contaminants
• The 3520 winter kit has a 2 lb Oxidizing Shock &Swim