Fritz Algae Clean Out is a concentrated, EPA-registered algaecide that clears string algae, blanketweed, and green water in freshwater and saltwater. It contains no copper and is reef safe and plant safe when used as directed. Explore more algae and water care.Features EPA-registered algaecide, highly concentrated Clears string algae, blanketweed, and green water Contains no copper Reef safe and safe for fish and live plants when used as directed Works in freshwater and saltwater aquariums, fountains, and small ponds How to Use Use 6 drops per 10 gallons, or 5 mL per 60 gallons Repeat every three days until the algae is controlled Manually remove as much algae as possible before and after treatment ImportantNot safe for freshwater invertebrates; remove snails, shrimp, and other crustaceans and molluscs before dosingSpecifications Brand Fritz Type Algaecide (copper-free) Water Type Freshwater and saltwater Size 4 oz Reef Safe Yes, as directed Origin Made in USA Recommended Pairings Polish cloudy water with Fritz Crystal Clear Rebuild the biofilter with FritzZyme Trace Browse more water care Frequently Asked QuestionsIs it reef safe?Yes, testing shows it is reef safe when used as directed, and it contains no copper.Can I use it with shrimp or snails?No, remove freshwater invertebrates before dosing.How often do I dose?Every three days until the algae is under control.