ReefPure Marine pH Buffer is our original marine buffer containing bicarbonate, carbonate and borate salts. It is carefully formulated to raise low pH levels and raise alkalinity gently. Lower quality, poorly formulated competing products frequently raise the pH too suddenly and allow it to drop again in a short period of time. This instability is harmful to the marine and reef aquarium, we constantly need to strive for maximum stability. In addition, our advanced mixing process and equipment eliminates the need for anti-caking agents and other unnecessary additives found in competing products. Available in 250g, 500g, 1000g and commercial sizes.