ReefPure Marine KH Buffer w/Magnesium is an advanced product designed specifically for buffering the reef aquarium. It contains several additional elements to benefit living corals. This special formulation also contains NO non-Carbonate buffers which may cause false readings on test kits and non-Carbonate Alkalinity is not utilized by corals for growth. ReefPure Marine KH Buffer w/Magnesium is ideal for building high alkalinity while stabilizing the pH in reef aquariums. In addition, our advanced mixing process and equipment eliminates the need for anti-caking agents and other unnecessary additives found in competing products.