JRG 5195.032 Montage- Und Bedienungsanleitung Seite 70

E
Water Hardness Classification
Water hardness mmol/l
very soft < 0.7
soft 0.7 - 1.5
slightly hard 1.5 - 2.5
moderately hard 2.5 - 3.2
hard 3.2 - 4.2
very hard > 4.2
Source: SVGW W10027 of June 2015
Example for adjusting the water hardness
Untreated water hardness
Target water hardness
For example, Switzerland's SVGW recommends doing without water softening in residential
areas with a water hardness below 32 °fH.
70
°dH
< 3.9
3.9 - 8.4
8.4 - 14
14 - 17.9
17.9 - 23.5
> 23.5
40 °fH
15 °fH
°e ppm
< 4.9 < 70
4.9 - 10.5 70 - 150
10.5 - 17.5 150 - 250
17.5 - 22.5 250 - 320
22.5 - 29.5 320 - 420
> 29.5 > 420
°fH
< 7
7 - 15
15 - 25
25 - 32
32 - 42
> 42