What does German degrees mean in practice?
One German degree corresponds to 17.848 mg CaCO3/l, therefore the result can be converted into mass units of hardness.
When does it matter?
Errors occur when °dH is confused with French degrees or with the actual concentration of calcium itself.
Which solutions are related to it?
The °dH symbol is given for each result and the appropriate factor is applied before setting the softener capacity.