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Slightly hard to moderately hard:
100-200 mg/l as calcium carbonate
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Hard to very hard:
above 200 mg/l as calcium carbonate
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Due to the complexity of water supply systems, the map can
only give an indication of the likely hardness of the water in different
parts of England and Wales. Precise information on the hardness of
individual supplies is available from local water utilities on request
from their customer services units or help lines.
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