The Earth has been polluted for a long time, but human didn't care about it. The nature, animals, the ocean are polluted. As water is an important element of human health, polluted water directly affects the human body. Water pollution causes various diseases like typhoid, cholera, hepatitis, cancer, etc. Water pollution damages the plants and aquatic animals present in the river by reducing the oxygen content from the water. If we had the machine, we would go back to fix it.