Water is one of the most precious commodities on earth, 97.2% of the total water on earth is salt water, only 2.8% is fresh water. Only 10% of this fresh water is used as drinking water. Water shortage threatens the economic and social gains and is potential fuel for conflicts (UN Secretary General Ban Ki Moon, 2007). Experts say that future wars are not conducted over oil but over water. For it is much more precious.