API PROPER PH 7.0 by API $12.73 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Adjusts and stabilizes ph levels. Detoxifies heavy metals. Neutralizes chlorine. For use in freshwater aquariums only. Will set ph level at 7.0, a neutral level ideal for community aquariums of different species.