Instant Ocean Sea Salt for Aquariums is engineered to provide the closest match to natural seawater for your marine aquarium. This formula contains all important major and minor trace elements necessary for a healthy aquarium with no nitrates or phosphates. It is easy to mix and dissolves quickly in water, which provides marine fish, invertebrates and plants the major, minor and trace elements they need. This fast-dissolving salt can also be added to ordinary dechlorinated tap water or purified water. Simply stir and then aerate and be sure to test for proper salt level for the best results. Maintain your aquarium and watch it flourish with Instant Ocean Sea Salt for Aquariums.