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hard water
(redirected from Water hardness)

   Also found in: Medical, Wikipedia, Hutchinson 0.14 sec.

hard water

Water that contains mineral salts of calcium and magnesium, principally as bicarbonates, chlorides, and sulfates, and sometimes iron. Hardness caused by calcium bicarbonate is known as temporary, because boiling converts the bicarbonate to the insoluble carbonate; hardness from the other salts is called permanent. The calcium and magnesium in hard waters form a hard, adherent scale on boiler plates, increasing fuel consumption and leading to deterioration through overheating. Home water softeners consist of tanks containing zeolite minerals or ion-exchange resins, which contain sodium ions that change places with the calcium and magnesium.


hard water [′härd ¦wȯd·ər]
(chemistry)
Water that contains certain salts, such as those of calcium or magnesium, which form insoluble deposits in boilers and form precipitates with soap.


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Since the 1950s, several epidemiologic studies have demonstrated an inverse relation between water hardness and cardiovascular disease (CVD) (Crawford et al.
The amount is determined by water hardness, soil level of dishes and cycle selection.
ScaleBlaster reduces water hardness while eliminating limescale--deposits that foul water pipes and downstream appliances and surfaces such as water heaters, laundry machines, HVAC systems, etc.
 
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