Water is basic need of human and other living things. It is also required for farming cleaning & industrial purpose. Water scarcity already affects every continent. Around 1.2 billion people, or almost one-fifth of the world’s population, live in areas of physical scarcity, and 500 million people are approaching this situation. Another1.6 billion people, or almost one quarter of the world’s population, face economic water shortage. Water scarcity is among the main problems to be faced by many societies and the World in the XXI century. Water use has been growing at more than twice the rate of population increase in the last century, and, although there is no global water scarcity as such, an increasing number of regions are chronically short of water. Large water is required for construction activities. It is required to use available water effectively. Generally there are following main purposes which require large amount of water:

Domestic Purpose, Farming Purpose, Industrial Purpose and Construction Purpose So, economical water treatment is needed.