DRINKING WATER INSPECTORATE Water hardness What causes hard water? Rain water is naturally soft but once it falls on the ground and percolates through rocks it picks up natural hardness minerals, such as calcium and mag

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Date: 2013-07-11 11:33:07		DRINKING WATER INSPECTORATE Water hardness What causes hard water? Rain water is naturally soft but once it falls on the ground and percolates through rocks it picks up natural hardness minerals, such as calcium and mag Add to Reading List Source URL: dwi.defra.gov.uk Download Document from Source Website File Size: 92,42 KB Share Document on Facebook