On February 1, 2007, the hardness ranges were adapted to European standards and the millimoles total hardness per liter was replaced by the (from a chemical point of view, nonsensical) millimoles of calcium carbonate per liter. Water supply companies will probably continue to publish the total hardness, but this is not required by law. The new hardness ranges hardly differ from the previous ones, only ranges 3 and 4 are combined to form the hardness range "hard" and the numbers 1,2,3 and 4 are replaced by the already common descriptions "soft", "medium" and "hard". replaced. The new hardness ranges are defined as follows:
Table | Water hardness and conversions:
[bs_row class="row"][bs_col class="col-md-4"]
hardness range
soft (1) medium (2) hard (3 and 4) [/bs_col][bs_col class="col-md-4"]
Millimoles of calcium carbonate per L
less than 1,5 1,5 to 2,5 More than 2,5 [/bs_col][bs_col class="col-md-4"]
hardness range
Less than 8,4 °dH 8,4 to 14 °dH More than 14 °dH [/bs_col][/bs_row] [hr]
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