Complete artificial seawater salt blend with an ionic composition formulated for coral growers. Concentrations of Mg, Ca, K, and Sr are linearly increased, while Na is decreased to maintain appropriate salinity value. Enhanced alkalinity. Mixes to a final salinity value of 35.4. Minor and trace elements included are specifically those not considered by researchers to be phytotoxic and which exhibit a nutrient-type depth profile in open oceanic waters. Clean; no residue in mixing vessels.
 
Formul8 salt blends consist of four components:
Component 1, NaCl, ≥99.5% purity, free of any additives including anti-caking agents.  User may source this material locally in order to save on overall cost.  In North America, three commonly available examples are: Morton Purex (not TFC Purex, which contains Sodium ferrocyanide as an anti-caking agent); Cargill Hi-Grade Granulated; U.S. Salt Superior General Purpose. These products meet Food Chemical Codex (FCC) standards, and are available from regional suppliers in pallet quantities of 49 bags (50 lbs. each). 
Component 2, MgSO4 | 7 (H2O) (aka Epsom salt), USP-grade, free of any additives including anti-caking agents.  User may source this material locally in order to save on overall cost.  Any brand of material meeting these specifications is suitable.
Component 3, one of the two solution blends required.
Component 4, the other of the two solution blends required.
 
There are three purchasing options available:
1 - 4, the complete mix;
2 - 4, requiring that the user supply their own suitable NaCl (Component 1);
3 - 4, requiring that the user supply their own suitable NaCl and MgSO4 | 7 (H2O) (Components 1 and 2, respectively).
 
If sourcing Components 1 and/or 2, then please note that per 80-gallon mix of this salt blend, the following quantities are required:
Component 1: 18.828 lbs. (8,540.094 g)
Component 2: 4.839 lbs. (2,195.072 g)