Don’t close your pool without adding this chemical. Once you’ve cleaned your pool surfaces and balanced your water, it’s time to add some ALGAECIDE. This will stop algae from growing over the winter while your pool is closed. Look for a 60% Polyquat Algaecide, especially if you have a mesh cover. And if you already have an algae issue before closing your pool, be sure to eliminate the issue before putting a lid on it. Follow us at Swim University for more pool care tips throughout the year. #poo