Introduction West Bengal, India, Public Health Engineering Department (PHED) is evaluating treatment processes to remove arsenic from drinking water supplies. The levels of arsenic in raw water supplies in this state in eastern India frequently exceed the country’s drinking water limit of 50 µg/l; some supplies may contain 1,000 µg/l. It is possible that the Indian limit for arsenic in drinking water may be reduced to 10 µg/l in future ye

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