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In short, you can't... If you dig into Palmer's spreadsheet version of the monograph you're trying to use, you see that effective hardness is equal to: [ppm Ca x 1.4] + [ppm Mg x 1.7]* * See cell K15 on the Mash sheet Not getting too far into detail, this is a simplification of the Kolbach formula that Palmer refers to on the page you linked: Residual ...

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