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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.
Some RO purifiers have a device that destroys bacteria in the water.
3.
Calcium hydroxide is the reagent in of removing hardness of water.
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