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Water hardness
Hardness
level
Water
quality
Water
hardness
in mmol/l
German
hardness
°d
I soft 0 - 1.3 0 - 7
II moderate 1.3 - 2.5 7 - 14
III hard to
very hard
over 2.5 over 14
Water softener
If the water hardness level is between II
and III, you can soften the water to
reduce detergent consumption.
The detergent packaging should
indicate the correct amount to use in
your machine. Add the detergent, then
add the water softener. You can then
use the recommended amount of
detergent for water hardness level I.
Detergent
16