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Hardness tolerance

The plants' water hardness requirement is only stated if the hardness has an important effect on growth.
Very soft (GH <3 dh)
Soft (GH = 4-8 dH)
Average (GH = 9-13 dH)
Hard (GH = 14 - 20 dH)
Very hard (GH > 20)
It is most often the water hardness in connection with the pH value which is of importance. A coming page on water chemistry will contain more information about this.