Grunbeck softliQ:SC, Operating Manual

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13.2 Sodium content in the water
When softening water by 1 °dH (0.18 mmol/l), the sodium content increases by approx.
8.2 mg/l. The German Drinking Water Ordinance specifies that the sodium content of
drinking water must not exceed 200 mg/l. Select a soft water hardness with a sodium content
less than 200 mg/l.
The local water suppliers will inform you about the sodium content of your raw water.
Sample calculation:
Raw water hardness: 28 °dH (50 °f, 5 mmol/l)
Sodium content in the raw water: 10.5 mg/l
Admissible increase of the sodium content by softening:
● 200 mg/l - 10.5 mg/l = 189.5 mg/l
● 189.5 : 8.2 = 23 °dH (41 °f, 4,1 mmol/l)
The raw water hardness may be reduced from 28 °dH (50 °f, 5 mmol/l) to 5 °dH (9 °f,
0.9 mmol/l).
13.3 Hardness ranges
The hardness ranges were classified according to the German Act on Detergents and
Cleaning Agents published in 2007.
Hardness range °dH °f
Soft < 8.4 < 15
Medium 8.4 – 14 15 – 25
Hard > 14 > 25
► When dosing cleaning agents, take the new hardness range of your water into
account.