Get your pool (up to 16,000) gallons ready for winter. When used before closing, this kit will keep your pool water clear and odor-free all winter long. One pint of Robelle Winter Algaecide 20 will control algae growth during the winter months. This kit also includes one quart of Robelle Winter Clear, which will help keep your pool clear during the winter. If your water is clean and covered, this winter kit will keep your pool water clear all season long. Using the proper winter chemicals makes your pool easier to open in the spring. We recommend a double dose of shock 24 hours prior to adding the contents of this Winter Kit.