The plant consists of One cation Exchanger column containing cation exchanger resin. One anion exchanger column containing anion exchanger Resin. Plant ismounted on M.S. stand with assembly of valves and tubing. One conductivity meter with cell to monitor the ionized solids of purified water and thus control the functions of de-mineralization. The meter is direct reading having reading heavy range 0.40 microns/cm.