Page 95 - Science - 5

Distilled water is used :

w in batteries, cars and inverters.
w in science laboratories.

w to make medicines.
SUPPLY OF WATER TO OUR HOMES

We drink water when we feel thirsty. Water not only quenches our thirst but is
essential for other body functions. It removes

wastes and toxins, in the form of sweat and

urine from our body. Before supplying the
clean water in our taps, the water is first

treated to make it fit for drinking.
The municipality of a town treats the

contaminated water consisting germs which

can cause diseases like jaundice, cholera and
typhoid. Water is treated by the processes like

sedimentation, filtration and chlorination

before it reaches our homes.

1. Sedimentation : The water is

pumped from the river and stored into a

tank. In order to remove the impurities,
chemicals are added which help insoluble

impurities to settle down.
2. Filtration : After the process of

sedimentation, the water is collected in
another tank and passed through sand,

gravel and charcoal to remove suspended

insoluble impurities.
3. Chlorination : The filtered water is

taken into a third tank where chlorine is
added to kill harmful bacteria which cause

water-borne diseases.
4. Storage : Finally, the clean

chlorinated water is stored in huge tanks
and supplied to the city.
Filtration Process
Filtration Process
Filtration Process
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