Culinox 999 Food Grade Salt is high purity, food grade granulated sodium chloride produced in vacuum pans from chemically purified brine. The crystals are cubic in structure. Brine treatment, crystallizing technique, and post-crystallizing washing substantially reduce calcium, magnesium, iron, copper and other heavy metals, sulfate and carbonate impurities. High purity helps assure consistent saltiness intensity, and there are stringent standards on visible, insoluble extraneous material. There are no additives.