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| hardness | washing soda | ultraviolet | chloride |
| boiling | distillation | aeration | infrared |
| sodium | suspended impurities | minerals | ion-exchange resin |
| typhoid | potash alum | Clark’s method | sulphates |
1.
The process of blowing compressed air into purified water is .
2.
When passing water through a column of ion-exchange resins, calcium and magnesium ions are replaced by ions.
3.
The chemical is added to the sedimentation process to speed up the process.
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