Hard Water

Water with a high degree of hardness, more than 3.5 mmol/l.

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Waterhardness Directory

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The Water Hardness Directory is a community that allows any user to enter values for any city in the directory. Nothing but a user account is needed. The system is practically self-monitoring, since anyone can transmit a value and the average degree of hardness is determined from all values. Nevertheless, all information is not guaranteed and should be checked in case of doubt.

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