Water hardness and composition
The hardness represents the amount of calcium and magnesium dissolved in the water. Water hardness is generally expressed in French degrees (°f or °fH). 1 French degree (°f or °fH) is equal to |
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Lime scale = calcium carbonate (CaCO3)
Water hardness scale:
from 0 to 5°fH: very soft water
from 5 to 15°fH: soft water
from 15 to 25°fH: medium hard water
from 25 to 40°fH: hard water
> to 40°fH: very hard water