In The Swim Pool Closing Kit - Winterizing Chemicals for Above Ground and In-Ground Pools - Up to 15,000 Gallons MulticolorThe In The Swim Pool Winterizing and Closing Chemical Kit is designed to save you time and money by including all the necessary chemicals to close your pool. Making for a simpler pool closing experience, and providing an easy transition for pool opening season come spring. Unlike chlorine based winter kits that reduce the effectiveness of other pool winterizing chemicals and can stain, bleach or damage pool surfaces, our chemical kits won't damage