"Deterioration in the natural form of water is caused by mixing unwanted elements more than the specific limit. Use of such water causes various water-borne diseases. Pollutants deforming water enter from different sources on account of human activities and they cause harmful effects on man. Other creatures on earth and in water are also affected by it.A World Health Organization (WHO) report of 1982 had indicated effect of water pollution on man as under:1. Every year 2,500 persons die in the world due to use of polluted water.2. Every year 2,500 persons and one crore children die in the world due to non-availability of sufficient water.3. In the world, 200 crore persons do not get pure and perfect drinking water.4. In developing countries, four out of every five children die because of water-borne diseases.5. Every year 50 crore persons suffer from water-borne diseases.6. 30 per cent population of t…