Instant Ocean Sea Salt for Aquariums is engineered to provide the closest match to natural seawater for your marine aquarium. This formula was developed from years of research and contains no nitrates or phosphates, which is why it’s the sea salt mixture that’s most trusted by hobbyists, experts and professional research facilities. Instant Ocean Sea Salt is easy mix and dissolves quickly in water and provides marine fish, invertebrates and plants the major, minor and trace elements they need. You can add it 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.