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Edward said:
Usually people think if there is GH there must be Ca. Wrong. There may not be any Ca or any Mg and still get nice dGH readings.
This is one the many reasons why people should contact their water company and request for a COMPREHENSIVE water report. It will detail the exact concentrations of Ca and Mg, among a host of other variables. The report is free.

I wish more people would participate in IUnknown's post so the "lazy" among us would have even less incentive to lift a finger. :|
 
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