CONCENTRATED COST-EFFECTIVE ALGAE CONTROL! Blue Wave's super concentrated algaecide goes a long way to killing and preventing all types of algae in your swimming pool. Non-metallic, non-staining formula is great for all pool types and will not discolor hair. A great algaecide for weekly maintenance. Dosage: Only 1.3 oz. per 10,000 gallons. Buy 4 quarts and SAVE!