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Our delivery: - water treatment plants - treatment cardridges - water counter - parts for connection

Hardness bands in overview:

lower than 7 °d	hardness band 1	soft	lower than 1,25 mmol / l
7-14 °d	hardness band 2	medium	1,25 - 2,5 mmol / l
14-21 °d	hardness band 3	hard	2,5 - 3,75 mmol / l
more than 21 °d	hardness band 4	very hard	more than 3,75 mmol / l

°d   =   1 mg CaO pro 100 ml water   =   0,179 mmol / l