Metric Two Part Recipe

Part 1 (Alkalinity)
Sodium Carbonate (NaC03) 98.7 grams/Liter (1 Molar 106 grams/Liter)

Part 2 (Calcium}
Calcium Chloride Dihydrate (CaCl2:2H2O) 131.6 grams/Liter (1.18 Molar)

Part 3A (Magnesium)
Magnesium Sulfate (MgSO4;7H2O) 179.05 grams/Liter
Magnesium Chloride (MgCl2:6H2O) 298.4 grams/Liter

Part 3B (Magnesium)
Magnesium Sulfate (MgSO4:7H2O) 447.47 grams/Liter (7.36 Molar)

Dose equal parts of Alkalinity and Calcium to maintain the desired levels in the aquarium. 
Dose either Magnesium (3A or 3B) at 0.16 the rate of the calcium dose.