Bibliography

Hardness Hach|| Hard water|| Temperary Hardness|| Permanent Hardness|| Explanation of Hardness|| House Hold Water Quality|| Our Data|| Tools we used|| About Us||| Bibliography|| Glossary||

 

These are the websites we studied to make ours!

http://en.wikipedia.org/wiki/Hard_water

http://water.usgs.gov/owq/Explanation.html

http://www.ext.vt.edu/pubs/housing/356-490/356-490.html

http://www.thekrib.com/Plants/CO2/hardness-larryfrank.html

http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/P/Ppm.html