USC Sani-Tabs are easy to use, simply use 1 tablet per gallon of water to accurately and easily prepare your sanitizing solutions at the proper concentrations. The tablets dissolve in water producing a distinct, clear, pale blue sanitizing solution that is long lasting and usually remains effective all day. Solutions are non-irritating to the hands, non-corrosive to metals, non-staining and odorless. This product is EPA Registered and NSF listed.