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In filtration process, plant water is filtered using layers of-

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Sand and clay

Sand and fine gravel

Clay and fine gravel

Sand, fine gravel, and medium gravel

answer is D.

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Detailed Solution

During wastewater therapy wastewater is allowed to enter a grit of sand, fine gravel, and medium gravel. Here, the velocity of wastewater is slowed down to allow sand, first-rate gravel, and medium gravel to settle down.

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