Sir: Drinking of pure water is necessary for all of us. And providing pure water to its citizens is duty of state. Low quality water helps different diseases to increase. Recently, World Bank announces that worsening quality of water slows down the economic growth of a country by one third. Combination of sewage, bacteria, chemicals and plastics suck the oxygen out of water supplies and make it poisonous. As Pakistan is already in crisis and people have low quality water so our government should take measure to provide clean drinking water. TAUQEER HUSSAIN Karachi