Instant Ocean salt is the most carefully formulated and most carefully manufactured synthetic sea salt in the world. It's pharmaceutically blended and scientifically analyzed. This complete formula contains every major, minor, and trace element necessary to insure that even the most delicate marine fish, invertebrates, and plants will thrive. Exceptional solubility provides a clear solution in minutes and can be used immediately after mixing. Reaches and maintains proper pH quickly. The convenient one-part form is easy to use for mixing complete package or small quantities-no special additives to handle. Uniform particle size assures consistency throughout package-no separation during packaging and shipping. Nitrate-free. Phosphate-free. Simply put, no other product outperforms Instant Ocean salt. It's the world's most popular brand.