Coral Pro salt has been designed with the modern aquarist in mind. It has been formulated especially for use with mineral free water from reverse osmosis filtration systems or very soft tap water. This water typically has little to no buffering capacity or dissolved minerals that are necessary for the health of your aquarium and its inhabitants. The chemically balanced formula in this salt mix helps to quickly establish a stable pH while providing high available levels of calcium and other elements to keep your corals, coralline algae and ther invertebrates thriving, even in aquarium salinities lower than those found in the ocean. This salt is free of nitrates and phosphates to cut down on nuisance algae and cyanobacteria growth.