A scientist at the Karnataka State Council for Science and Technology here, claims to have developed a cost-effective method for domestic and individual drinking water treatment, using a silver wire.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/purifying-water-using-silver
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/deccan-herald-bangalore
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmental-science