Halcyon Marine Reef Salt Mix is a precisely formulated and manufactured mix of all of the necessary inorganic components of natural seawater in the proper ratios. It is manufactured in small batches in our own factory under tight quality controls and is not simply another company’s product labeled with our brand. It does not utilize any natural seawater desalinization residue or wastes, but is entirely manufactured from reagent grade, pharmaceutical grade, and tested and assayed ingredients. This assures the finest quality salt available anywhere in the world. Halcyon has been developed through decades of testing and experience manufacturing salt mixes, not merely months, as other salts claim. Halcyon combines the highest level of marine chemistry with the utmost knowledge of reef aquarium husbandry.