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Re: Calcium

You misunderstood the original question. The original post asked about 
the Ca concentration, not hardness.

Calcium at 90 ppm equals 100/40 
as ppm CaC03 or about 225 ppm CaCO3. Add to this the Mg ion and your total 
hardness (assuming a 2:1 Ca:Mg ratio) is approximately 400 ppm or 22dh.
This is just one example of why I dont take TOA too seriously.