Frieda S.: When recommending water ionizers, you always state the hardness levels in 0dH (degree of German hardness). However, my drinking water supplier's analysis states mmol/l. On the other hand, mineral water bottles say mg/l. How can these values be compared?
Drill again. As a consumer, you have a right to information. I really don't know what use this confusion of terms is supposed to do for the consumer. It's like many things in international standardization and it unsettles most people. Maybe the drinking and mineral water industry doesn't want people to be able to compare right away. Here are some resources for self-help:
- Sodium (Na+): 22,99
- Potassium (K+): 39,1
- Calcium (Ca2+): 0,08
- Magnesium (Mg2+): 24,31
- Iron (Fe-II): 55,85
- Manganese (Mn2+): 54,94
- Ammonium (NH4+): 18,039
- Hydrogen carbonate (HCO3-): 61,017
The previously common indication of the ingredients in mg/l (milligrams per liter), which can still be found on mineral water bottles, is giving way to the modern designation with mmol/l (= millimoles per liter). In order to be able to compare your drinking water with mineral water, you must multiply the given value in mmol/l by the molar mass of the corresponding atom given below and then obtain the values in mg/l.
- Chloride (Cl-): 35,45
- Sulfate (SO42-): 96,066
- Sulphide (S2-): 32,07
- Nitrate (NO3-): 62,004
- Nitrite (NO2-): 46,005
- Phosphate (HPO42-): 95,974
- Silica (SiO2): 60,088
The water hardness is converted as follows:
Some water suppliers limit themselves to not publishing complete analyses.
These are only available upon request.
Many only specify the hardness ranges according to the German Detergents and Cleaning Agents Act of 2007. There are only 3 hardness ranges.
In Germany there are water hardnesses of over dH 30.
The upper half, which used to be more subdivided, was simply connected via dH 15.
So no one has to say anymore that they deliver very hard water. However, this differentiation still exists in Switzerland.
In the Switzerland A distinction is made between the hardness ranges according to 6 hardness levels in degrees of French hardness or mmol/l as follows:
Excerpt from the book by Karl Heinz Asenbaum: “Electro-activated water – An invention with extraordinary potential. Water ionizers from A – Z”
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