What exactly does water hardness mean?
The water supply companies in Germany must indicate the degree of hardness of the drinking water. It describes the concentration of calcium and magnesium ions in tap water, whose properties are determined by this content.
The degree of hardness is divided into the following areas:
– soft: less than 1.5 millimoles of calcium carbonate per liter, 8.4 ° dH
– medium: per liter 1.5 – 2.5 millimoles of calcium carbonate, 8.4 ° to 14 ° dH
– hard: per liter over 2.5 millimoles of calcium carbonate, more than 14 ° dH
The water hardness 1 corresponds to soft, 2 medium, 3 hard and 4 very hard water. Basically, therefore, the higher the proportion of calcium and magnesium ions, the harder the water.