Instructions: Add 9 drops per pint (473 ml) or 18 drops per quart (946 ml) of bowl or aquarium water. For larger aquariums, add ½ teaspoonful (2.5 ml) per gallon (3.8 L) of water. Repeat dose daily for up to 7 days, and then make a water change. Treatment may be repeated, if necessary. For tropical fish use only.