In The Swim Bundle 2 Items: Deluxe Pool Winterizing Closing Chemical Kit Pools up to 15,000 Gallons Winter Ball Stain Preventer Bundle of 2 items-Deluxe Winterizing Chemical Kit and Winter Ball Stain Preventer Deluxe winterizing kit contains necessary chemicals for closing pools up to 15,000 gallons Winter ball is an enzyme based stain preventer that treats up to 30,000 gallons