Kent Marine Aquarium pH Buffer is a specially formulated pH buffer and alkalinity or carbonate hardness (KH) builder, designed to adjust the pH of saltwater aquariums to the range of 8.0 to 8.3 and build the KH. Marine Aquarium pH Buffer is the finest buffer available for either fish only or reef type marine aquariums and is designed to mix clear with little or no cloudiness or precipitation. Will not flake on your corals as other competing products can! Compatible with and designed for use with Kalkwasser Mix, Concentrated Liquid Calcium, or Turbo-Calcium by Kent Marine.