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Water softener
For medium to high water hardness (hardness class II upwards), you
should use softener. Refer to the manufacturer's instructions. Then al-
ways add the appropriate amount of detergent for hardness class I
(= soft). The responisable water works will provide information on the
local water hardness.
2Since the water softener is rinsed in before the main detergent (water
pre-softening), 80% of the stated quantity of softener shown on the
package is sufficient.
Water hardness details
Hardness class Water hardness in °dH
(German hardness scale)
Water hardness in mmol
(millimol per litre)
I - soft 0 - 7 to 1.3
II - medium hard 7 - 14 1.3 - 2.5
III - hard 14 - 21 2.5 - 3.8
IV - very hard greater than 21 greater than 3.8