The Fritz Aquatics 80243 Reef Pro Mix is a complete marine salt mix that provides all of the essential elements for a healthy reef or fish tank. This salt mix contains all of the major, minor, and trace elements that are necessary to support a healthy system. The enhanced buffer levels help to keep the pH stable after the salt has been mixed into the water. The calcium, magnesium, and potassium levels are also increased so that they can be used by the fish. The nitrate, phosphate, and ammonia free status ensures a safe environment for your fish.