Seachem Alkaline BufferSeachem Alkaline Buffer raises the pH and alkalinity (KH) of your aquarium water and holds it steady between 7. 2 and 8. 5 an ideal range for most freshwater environments. Alkaline Buffer is safe, gentle, and phosphate free to reduce the risk of algae or cloudiness. Raises pH and increases alkalinity Buffers pH between 7. 2 and 8. 5 Great for planted aquariums or very hard water Seachem Alkaline Buffer is a sodium bicarbonate based buffer. This makes