Theory:

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Water is used by our bodies to help control body temperature and sustain other bodily functions. It is found in all cells, organs, and tissues.
 
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Since our body loses water by breathing, sweating, and digestion, it is important to drink fluids and eat foods that contain water to rehydrate and replace it.
Example:
Let us now see the process of water purification.
 
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 Waterworks in towns provide drinking water
 
Unwanted chemical compounds, organic and inorganic products, and biological pollutants are separated from water during this purification process.
 
Stage 1: The water is collected in the reservoir from various sources.

Stage 2: The collected water is then passed to the sedimentation tank, where the solids settle down.

Stage 3: In this loading tank, the suspended impurities settle down as sediments.

Stage 4: The filtration tank contains gravel, coarse sand, and fine sand. The water from the loading tank enters the filtration tank, where the sedimentation takes place.
 
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Simple filtration process
  
The sedimentation process is a physical treatment where the impurities settle down. This is according to gravity. This filtration tank acts as a simple bio-sand water filter. This filters most of the contaminants present in the water.

Stage 5: The water from the previous tank enters this chlorination tank, where the microbes are killed. This is germ-free water that is now safe to drink. Finally, the treated water is supplied for consumption in cities.