Water is important for the existence and growth of industries. Hence, the quality of water is of vital concern for the mankind since it is directly linked with human welfare. But, much of the available freshwater is being contaminated with harmful elements such as sulfuric acid, fertilizer and gasoline. In fact, only 1 % of the world’s water is usable to us. About 97 % is salty seawater and 2 % is frozen in glaciers and polar ice caps. This happens as fresh water circulates through the hydrologic cycle. Water is essential and inevitable for the survival of almost all known forms of life on earth. Human civilization, agriculture and industries have historically flourished around rivers and major waterways. Thus 1 % of the world’s water supply is a precious commodity necessary for our survival. As precipitation... Clean and fresh drinking water is essential to human and other lives. Contaminated water may contain harmful elements, which could cause illness and death if ingested.