I work with Flash evaporators, RO plants, boilers and some neuclear plants De-Ionisers training. 0.1 to 70 ppm is demin, 70 to 1000ppm is potable.Though our demin is 0.1 to 10 ppm generally. Corrosion is eliminated by passing potable water via Limestone filter (dolomite), use pvc type pipework...