Miele PWM 514 Operating And Installation Instructions page 29

Water hardness
levels
Water hardness level
I (soft)
II (medium)
III (hard)
Check with your local water supplier if you do not know the water
hardness level in your area.
Washing with detergent drawer
Total hardness in mmol/l
0–1.5
1.5–2.5
above 2.5
German scale °dH
0–8.4
8.4–14
above 14
29