Excessive algae growth is both unattractive and hazardous to fish and plant life. FritzPond Algae Clean Out is the most concentrated EPA registered pond algaecide available. FritzPond Algae Clean Out contains no copper and is safe for all ornamental fish and plants when used as directed. EPA-approved algaecide Stops algae growth No more green water Controls string algae Fast-acting Directions & Dosage Use 6 drops per 10 U.S. gallons (37.85 L). Use 18 drops (½ tsp/½ cap) per 30 U.S. gallons (114L). Use 5 ml (1 tsp/1 cap) per 60 U.S. gallons (227.1 L). Add recommended dosage near the filter outflow to mix into aquarium water rapidly. Remove dead algae from aquarium. Repeat dose every three days until algae is controlled. CAUTION: Not safe for use with freshwater snails, shrimp, clams, other crustaceans or molluscs. It is a violation of federal law to use this product in a manner inconsistent with its labeling.