BioGuard Soft Swim Filter Aid is a powerful flocculant clarifier. Designed to work correctly with any Soft Swim-equipped pools, rapidly eliminating cloudy or hazy water to restore it to its former brilliance. Its granular formula attracts together any microscopic particles in the water, making them heavy enough to settle on the pool bottom for quick vacuum removal. It can also be used to improve filter efficiency, restoring water to the jewel-like clarity.