The Seachem Alkaline Buffer water conditioner is designed to raise pH and Alkalinity, it is to be used in conjunction with the Seachem Acid Buffer. These buffers are made for the planted aquarium or for very hard water where phosphate buffers may pose and algae or cloudiness problem. The Alkaline Buffer raises pH and buffers between 7.2 and 8.5. It is gently, safe and enhances the freshwater environment.