"Acid Buffer™ is a non–phosphate buffer to lower pH and buffer with
Alkaline Buffer™. Both buffers are designed for the planted aquarium
or for very hard water where phosphate buffers may pose an algae
or cloudiness problem. Acid Buffer™ lowers pH and buffers between
6.0 and 8.0 when used with Alkaline Buffer™. As Acid Buffer™ lowers
pH it converts carbonate alkalinity (KH) into available CO2."