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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 magAdd to Reading ListSource URL: www.dwi.gov.ukDownload Document from Source WebsiteFile Size: 92,42 KBShare Document on Facebook |