WATER IS TREATED NOT ONLY TO IMPROVE IT'S QUALITY FROM AESTHETIC AND SANITARY POINT OF VIEW BUT ALSO TO REDUCE ITS CORROSION CARRYING CAPACITY AFFECTING WATER PIPES.

QUALITIES OF THE DRINKING WATER :-- Drinking water must be free from disease producing organism or harmful bacteria or micro organisms as colloidal matter , dissolved poisonous chemical substances of all kinds , objectionable gases --but may contain good amount of dissolved oxygen and the dissolved minerals which impart excessive hardness to water and must not deposit sediment on standing, Drinking water should not contain any appreciable amount of suspended matter It should as for as possible be colourless,odourless ,cool and pleasant to taste .Deep well waters may have a slight earthy odour. Pure water ,when in large quantities ,has a faint bluish tint,peaty water has a brown tint. Any other colour may indicate pollution .Warm waters are generally deficient in oxygen and are therefore somewhat unpalatable. The suitability of a water for any particular purpose can be determined only after a complete analysis and investigation of the source of origin of supply. A complete water analysis consists of four sections , Physical , Chemical, Bacteriological and microscopic and for drinking water supplies the bacteriological and the physical analysis are of the prime importance. The microscopic analysis is necessary to determine the existence and extent of organism that may create taste and odour problems. Raw water contains suspended ,colloidal and dissolved impurities .