API pH Down is a fast-acting liquid water treatment designed to safely lower and control the pH in freshwater aquariums when test results show levels that are too high. This colorless, easy-to-use formula won't cloud or colour aquarium water and is phosphate-free and nitrate-free, helping avoid unwanted algae growth. :contentReference[oaicite:1]{index=1}

• Lowers pH to make aquarium water more acidic
• Fast-acting, clear and easy to apply
• Won't cloud or colour aquarium water
• Phosphate-free and nitrate-free to help reduce algae risk
• Ideal for freshwater aquariums with pH above desired range
• Use with a freshwater pH test kit for best results :contentReference[oaicite:2]{index=2}