We employ Demineralization systems for conditioning water for high pressure boilers and for conditioning various process and rinse water. Its ion – exchange system is chosen as per the volumes and composition of the raw water, the effluent- quality require for different uses and the comparative capital and operation cost. In case silica removal is not required, the system may consist of a hydrogen – cation – exchanger unit and a weekly basic anion exchanger unit usually followed by a degasifier. This is done to remove by aeration most of the carbon dioxide formed from the bicarbonates.