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Hardness Questions

I am attempting to fully understand the concept of water hardness, 
particularly the methods of measuring it.  My AP test kits give German 
hardness results, while there are other methods I understanding that express 
hardness.  Also, there is the conductivity or total hardness electronic 
meters that one can buy, and I cannot discern how all of these methods 
interrelate and translate to each other.  Can someone give me some 
information and/or sources to pursue these questions?  Any help would be 
greatly appreciated.  


Don Lee

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