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C11, C12, C13
Water Hardness Level Indicators
Water
Hardness
Level
German
Hardness
dH
French
Hardness
dF
British
Hardness
dE
HARDNESS LEVEL
INDICATORS
1
0-5
0-9
0-6
2
6-11
10-20
7-14
3
12-17
21-30
15-21
4
18-22
31-40
22-28
5
23-31
41-55
29-39
6
32-50
56-90
40-63