Well i'm starting to run out of stuff to research on water hardness with the looks of what my group is researching but they don't have the equation to find water hardness....oh snaps. Although i don't understand the equation, i'm sure my group will help me with this.
http://www.water.ncsu.edu/watershedss/info/hardness.html
Hardness, mg equivalent/L CaCO3 = ([Ca,mg/l]*2.497) + ([Mg,mg.l]*4.116)
Also has some nice pics of what happens when hard water clogs up the pipes.
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