ProTeam Prevent is an economical, general-purpose algaecide for control of all types of algae and related slime. Its liquid formula can be added directly to pool water without dilution, and contains no copper or other metals that can cause future problems. Prevent is non-staining, EPA-registered, and is compatible with all forms of sanitizer. Best of all, Prevent is made right here in the USA to ensure the highest possible quality, allowing you to buy with confidence. Product Dosage Routine Maintenance: 5 fl oz per 10,000 gallons of water per week. Visible Algae Growth: 32 fl oz per 25,000 gallons of water.