Alkaline Bufferª is a non-phosphate buffer to raise pH and buffer with Acid Bufferª. These buffers are designed for the planted aquarium or for very hard water where phosphate buffers may pose an algae or cloudiness problem. Alkaline Bufferª raises pH and buffers between 7.2 and 8.5. It is gentle, safe, and enhances the freshwater environment. Contains sodium, potassium, magnesium, and other bicarbonate salts.