MgCl food flakes (99.0% pure) is a pure magnesium chloride hexahydrate (MgCl. HO) is a colourless, crystalline inorganic salt in flake form. Magnesium Chloride Flakes 99% (Mgcl2.6H2O 99 %) It is used in Aquaculture solution. Magnesium Chloride is an important industrial chemical, used in the production of magnesium, textile and paper manufacture, and cements in refrigeration and fireproofing and as a dicing agent.