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Certain studies have shown a certain relationship between cardiovascular diseases in men and water hardness. Numerous other studies have also come to the conclusion that there is definitely is a correlation between water hardness and cardiovascular health, but The World Health Organization claims that the data provided in the studies is inadequate enough for a water hardness recommendation. Some health reviews actually do set some recommendation for the minimum and maximum levels of magnesium and calcium in drinking water.

The reviews have also established a recommended total hardness of the water expressed as the sum of concentration of the two elements. The National Research Council claims that hard water poses no risk for the health of human beings. The National Academy of Sciences claims that it even contributes to the human dietary needs for magnesium and calcium and that it contributes to certain types of diet that contains higher amounts of calcium and magnesium.

Almost 90 percent of homes in the U.S. have hard water. This data comes from a certain study made by the United States Geological Survey. In certain lucky parts of the world such as Hawaii, New England, Pacific Northwest, and South Atlantic-Gulf, they get a supply of what is considered as the softest waters on the territory of the U.S. On the other hand, moderate hard waters can be found in Great Lakes, Tennessee, some regions in Alaska, and in the Pacific Northwest.

The hardest waters that contain more than a gram of magnesium and calcium per liter can be found in Kansas, Arizona, Texas, New Mexico and southern parts of California. Citizens of Canada also have their own troubles with hard water. Manitoba and Saskatchewan are rich in dolomite type calcium and magnesium which are soluble in the groundwater that is abundant in carbon dioxide trapped by the process of glaciation. These parts of Canada deal with waters that exceed 200 milligrams of calcium carbonate per liter.

The drinking water in England is also considered very hard by the British Drinking Water Inspectorate. The east England water exhibits above 200 milligrams of calcium carbonate per liter. The areas with softer water includes Devon, Wales, Cornwall and Northwest England. Believe it not, water gets further hardened during the brewing process by adding gypsum in the process of Burtonisation. Australia is no exception to the trouble with hard water. Melbourne has very soft water, while Adelaide has extremely hard water.

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