Total hardness is an important indicator of water quality, and has great relationship with industrial water consumption. Water hardness is the main factor to form the scale and affect the quality of products. In fact, the total hardness is mainly the hardness of calcium and magnesium ions. The general water hardness unit is mmol / L, but different countries have used different units, the following is the conversion tables of these water hardness units.
|
|
°dH |
°e |
°fH |
ppm |
mmol/l |
|
|
German degree |
1 °dH = |
1 |
1.253 |
1.78 |
17.8 |
0.1783 |
|
English degree |
1 °e = |
0.798 |
1 |
1.43 |
14.3 |
0.142 |
|
French degree |
1 °fH = |
0.56 |
0.702 |
1 |
10 |
0.1 |
|
ppm CaCO3 (USA) |
1 ppm = |
0.056 |
0.07 |
0.1 |
1 |
0.01 |
|
mmol/l |
1 mmol/l = |
5.6 |
7.02 |
10 |
100 |
1 |
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