Magnesium Nitrate with Anticaking (11-0-0 MgO:15%) NO Caking, is a 100% soluble source of ... MAGNESIUM NITRATE ** NO caking, and free flowing.Synonyms: Magnesium Nitrate 6-Hydrate; Magnesium (II) nitrate, hexahydrate; Nitric acid,magnesium salt, hexahydrate ... % MAXIRON (As Fe): 0.001% MAX.HEAVY METAL (As Pb): 0.002% MAX..PH: 4.0 MIN. Magnesium Nitrate with Anticaking (11-0-0 MgO:15%)