70
E
Water Hardness Classification
Water hardness
mmol/l
°dH
°e
ppm
°fH
very soft
< 0.7
< 3.9
< 4.9
< 70
< 7
soft
0.7 - 1.5
3.9 - 8.4
4.9 - 10.5
70 - 150
7 - 15
slightly hard
1.5 - 2.5
8.4 - 14
10.5 - 17.5
150 - 250
15 - 25
moderately hard
2.5 - 3.2
14 - 17.9
17.5 - 22.5
250 - 320
25 - 32
hard
3.2 - 4.2
17.9 - 23.5
22.5 - 29.5
320 - 420
32 - 42
very hard
> 4.2
> 23.5
> 29.5
> 420
> 42
Source: SVGW W10027 of June 2015
Example for adjusting the water hardness
Untreated water hardness
40 °fH
Target water hardness
15 °fH
For example, Switzerland‘s SVGW recommends doing without water softening in residential
areas with a water hardness below 32 °fH.
Содержание JRG 5195.025
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