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Simple water filter can nail arsenic.(Science And Society)

Field tests in Nepal suggest that people who live in areas with arsenic-tainted aquifers maybe able to purify their drinking water by passing it through a low-cost, low-tech filter with a simple active ingredient--a few handfuls of iron nails.

Groundwater in many areas of the world contains arsenic (SN: 11/15/03, p. 315). In the Terai region of southern Nepal, about 90 percent of the residents get their drinking water from wells, says Susan Murcott of the Massachusetts Institute of Technology. More than 500,000 of the region's inhabitants consume water with arsenic concentrations that exceed the World Health Organization's recommended threshold of 10 micrograms per liter, ...

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