°dH °e °fH ppm mval/l mmol/l Deutsche Hardness 1 °dH = 1 1.253 1.78 17.8 0.357 0.1783 English Hardness 1 °e = 0.798 1 1.43 14.3 0.285 0.142 French Hardness 1 °fH = 0.56 0.702 1 10 0.2 0.1
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