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Water hardness is a natural feature and results from the geology of the region, being made up from limestone. Minerals such as calcium and magnesium dissolve into the water as it moves round the ground. This guide should be taken as advisory and if your water hardness search results demonstrate results as Hard to Very Hard or Medium to moderately Hard then contact your local expert shown on the following page for advice Regional Sales team or check out our system efficiency brochure by clicking this link.