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hardness washing soda ultravioletchloride 
 boiling distillation aeration infrared
 sodium suspended impurities minerals ion-exchange resin
 typhoid potash alum Clark’s method sulphates
 
1
The \(Ca\) and \(Mg\) salts in water determine the  .
 
2.
Potash alum particles react with  to settle them more quickly.
 
3.
The process of  converts calcium hydrogen carbonate into insoluble calcium carbonate.
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