tank is used in purification of water, to remove heavy solid impurities by allowing them to settle down at the bottom.

Sedimentation

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Filtration

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Solution

The correct option is A Sedimentation
Sedimentation is the process of allowing particles in suspension in water to settle out of the suspension under the effect of gravity. The particles that settle out from the suspension become the sediments. It is a physical water treatment process used to remove suspended solids from water naturally.

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