Demineralised water. Water that is treated to be contaminant-, mineral- and salt free. In order to attain the salt and mineral free water, the salts and ions must be eliminated from the water. Demiwater is utilized in several applications where salt is existing minimal quantities and conductivity properties are needed. Demiwater consists of a minimal rate of conductivity and is favored for use in applications where metal equipment are incorporated and vulnerable to corrosive effects. The few amounts of ions makes the oxygen unable to react along with the metal surface to create rust or corrosion.