OnGuard K26002AD 15,000 Gallon Winter Kit #2 6 per Case for use protecting swimming pools during the winter off season. This kit comes with all necessary chemicals for pool closings including Winter Algicide, Winter Stain and Scale Preventer, and Winterizing Cartridge. Using OnGuard Winter Kit helps prevent the need for excessive cleaning and maintenance during the Spring, allowing pools owners to enjoy more time in the water and less time cleaning.