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Bibliography

http://courses.chem.ukans.edu/Fall2000/517/Experiments/Exp3_water_hardness.htm
http://www.biology.arizona.edu/biochemistry/tutorials/chemistry/page3.html
http://www.awwa.org/advocacy/learn/INFO/1FAQ.CFM
http://faq.thekrib.com/begin-chem.html
http://wilkes.edu/~eqc/hard1.htm
http://muextension.missouri.edu/xplor/hesguide/houseeq/gh4864.htm
http://www.softwaterdeals.com/howwatersoftwork.html
http://www.ianr.unl.edu/pubs/housing/g946.htm
http://www.ianr.unl.edu/PUBS/water/nf94.htm


http://www.howstuffworks.com/question29.htm