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Thooyavan, 08:06, 11 January 2008.. Wikipedia. 15 Jan 2008 <http://en.wikipedia.org/wiki/Hard_water>.

Office of Water Quality. 4-Nov-2007 08:13:28. USGs. 15 Jan 2008 <http://water.usgs.gov/owq/news.html>.

Wilson, Amber. "Household Water Quality - Water Hardness." June 1999. 18 Jan 2008 <http://www.ext.vt.edu/pubs/housing/356-490/356-490.html>.