Hard water usually consists of calcium (Ca2+), magnesium (Mg2+) ions, and possibly other dissolved compounds such as bicarbonates and sulfates. ... Hard water is generally not harmful.
http://en.wikipedia.org/wiki/Hard_water
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Hard water treatment information, water softener reviews and comparisons. ... This site contains information on hard water, problems associated with hardwater, the benefits of soft water, and water treatment. It also contains reviews and comparisons of the various methods available to control water hardness.
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www.hardwater.org/
www.hardwater.org/
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Hard Water Benefits ... Clothes washed in hard water often look dingy and feel harsh and scratchy. The hardness minerals combine with some soils to form insoluble salts, making them difficult to remove. Soil on clothes can introduce even more hardness minerals into the wash water.
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www.hardwater.org/hard_water_problems.html
www.hardwater.org/hard_water_problems.html
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Water molecules pick up particles from everything they touch, whether it's in streams, oceans, plumbing pipes or home water heating systems. In public tap water systems, it is not uncommon for water to pick up calcium and magnesium deposits...
http://www.ehow.com/how-does_4811990_watersoftener-salt...
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Hard water is probably the most common water problem found in the home. According to the Water Quality Association of the United States, hard water is water that contains dissolved hardness minerals above 17 ppm (parts per million).
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www.watersystems.co.nz/learn/hardwater.htm
www.watersystems.co.nz/learn/hardwater.htm
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Hard water problems with diagnosis and cures. ... Water described as "hard" means it is high in dissolved minerals, specifically calcium and magnesium. Hard water is not a health risk, but a nuisance because of its tendancy to cause mineral buildup in water pipe and heating systems, and its poor soap and/or...
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www.water-treatment.org.uk/hard_water.html
www.water-treatment.org.uk/hard_water.html
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What is hard water, and how does it effect your coffee and tea? ... There are several other negative effects that come from hard water, one being that soap and detergent won't foam up which can make washing difficult. Another related problem is that the insides of your coffee maker, espresso machine or tea kettle will get...
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coffeetea.about.com/cs/water/a/hardwater.htm
coffeetea.about.com/cs/water/a/hardwater.htm
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Chemistry of hard and soft water, with information about soaps, detergents, and water softening agents. ... I'm sure you've heard the terms 'hard water' and 'soft water', but do you know what they mean? Is one type of water somehow better than the other? What type of water do you have? Let's take a look at the definitions...
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chemistry.about.com/cs/howthingswork/a/aa082403a.htm
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USGS Water-Quality Informatio ... Information on water hardness has been moved to better serve you. Please see the water hardness and alkalinity page. ... USGS Home Water Resources Biology Geography Geology Geospatial...
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water.usgs.gov/owq/Explanation.html
water.usgs.gov/owq/Explanation.html
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