Bio-Dex Clearex 500 is a Pool Pro Favorite that clarifies, and brightens your pool and spa water, making it sparkling clean ! Dust storms, algae and phosphate treatments can cloud up your pool. Not to worry - Clearex 500 is designed specifically to treat cloudy water brought on by these and other causes. The product is not oil-based, and is petroleum-free, non-toxic, non-corrosive, non-flammable, non-carcinogenic, and hypoallergenic. Bio-Dex Clearex 500 is user friendly and safe. If you're looking for something to quickly turn your cloudy water clear – this is the clarifier for you ! Use as often as desired Professional strength product Works with all filtration systems Will not clog the filter Not necessary to vacuum after application Can be used with Oil-Out for a super water cleaning combo.