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.Rabinovitch, Isaac. "Hard water." Wikipedia. 06 oct 2008. 5 Mar 2009 <http://en.wikipedia.org/wiki/Hard_water>.

Rabinovitch, Isaac . "Temporary Hardness." Wikipedia. 06 oct 2008. 5 Mar 2009 <http://en.wikipedia.org/wiki/Hard_water>.

Wilson, Amber . "House hold water Quality." Virginia Cooperative Extension. June 1999. 5 Mar 2009 <http://www.ext.vt.edu/pubs/housing/356-490/356-490.html>.