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Hardness] About us] what is hard water?]
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What happens if you have hard water?]
Why do we care about hard water?] Glossary]
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"Hard Water." Wikipedia. 2003. 15 Jan 2008 <http://en.wikipedia.org/wiki/hard_water>.

Larry, Frank. "Hard Water." 17 Jan 2008 <http://coffeetea.about.com/cs/water/a/hardwater.htm>.

"What is hard water and why do we care?." Material Matters. missouri families. 17 Jan 2008 <http://missourifamilies.org/features/materialarticles/feature12.htm>.

Aguirre, Sarah. "Does Having Hard Water Require the Use Of More Dish Washing Liquid?." Housekeeping. 17 Jan 2008 <http://housekeeping.about.com/od/dishes/f/hardwtrdshlqud.htm>.

"Sources of Hardness Minerals in Drinking Water." Hard Water Hardness Calcium Magnesium. 18 Jan 2008 <http://www.water-research.net/hardness.htm>.

"Kitchens and Bathrooms." HARD WATER INCLUDES MIN ERALS THIS IS HEALTHY WATER. 09/20/2003. paypal. 18 Jan 2008 <http://users.penn.com/~tomwflye/water.htm>.

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