Caribbean Blue Sand Assist Sand Filter Aid and Enhancer Pool & Spa Chemicals Filter Aid-capture particles as small as 5 microns with your sand filter Increases filter efficiency by penetrating the sand with a highly effective polymer formula Restores water quality after heavy bather loads or heavy rains Use as needed to remedy hazy water or weekly to add sparkle to the water Contents of one 6 oz. pouch will treat 100,000 gallons of water