Get your pool (up to 30,000) gallons ready for winter. When used before closing, this kit will keep your pool water clear and odor-free all winter long. One quart of Robelle Winter Algacecide 10 and One pint of Robelle Winter Algaecide 20 which control algae growth during the winter months, while two quarts of Robelle Winter Clear keeps your pool water clear. 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.