A CARE investigator in Bangladesh has developed an efficient, low-cost method of treating arsenic-contaminated drinking water with a system that combines unglazed clay pots and low-tech filtration materials.About 95 percent of the population in Bangladesh is supplied by groundwater from five million wells. According to the World Health Organization (WHO), between 35 million and 77 million Bangladeshis are at risk of drinking well water containing dangerous levels of arsenic. Arsenic occurs naturally in the country, the result of dissolving minerals in rocks and soil. WHO refers to the situation as "the largest poisoning of a population in history."
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