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hard water
(redirected from Water hardness)

   Also found in: Dictionary/thesaurus, Medical, Wikipedia 0.01 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.

hard water
Water containing solutions of mineral salts (sulfates of calcium and magnesium, carbonates, and bicarbonates). Also see water softener.


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As experts say, it contributes 97% of water hardness and the rest are just minute amounts.
A new modern hardness measurement without the use of indicators enables fully automatic adjustment of softener cycles to the specific raw water hardness.
Siemens also announces the new Ionpure VNX-HH electrodeionization (EDI) module, which represents a significant advancementin feed water hardness tolerance, to two parts per million (ppm) as CaCO3 - a hardness level that is four times the industry standard of 0.
 
 
 
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