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The 2012 Reed Elsevier Environmental Challenge winner of the $50,000 first prize is the "Iron-amended Biosand Water Filter in Nepal" developed by Tommy Ngai, Director, Research Learning at the Centre for Affordable Water and Sanitation Technology (CAWST). Ngai's project modifies conventional Biosand Filters with iron particles to remove all three classes of water contaminants, including viruses, and bring safe drinking water to two impoverished rural villages in Nepal. Over a period of two years 150 filters will be installed, and CAWST will update its educational material and hold workshops to promote the technology. The project will target over 1,000 people in the two villages and has the potential to be scaled to help millions over the next 10 years.