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To raise magnesium by 50 ppm in 100 L: 41.8 g.
The main magnesium salt. Dosing it alone slowly shifts the chloride to sulfate balance, so the usual DIY mix pairs it with magnesium sulfate.
• Use the flake form sold for reef or bath use with no additives.
Molar mass 203.30 g/mol.
stoichiometry (IUPAC atomic weights)