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Layers of filters are used to filter water in filtration plants are

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Sand and clay

Clay and fine gravel

Sand and fine gravel

Sand, fine gravel and medium gravel

answer is D.

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Detailed Solution

Water is filtered using layers of sand, fine gravel, and medium gravel in a filtration plant.

The water is passed through layers of sand, fine gravel, and medium gravel, and depending on the pore size the impurities are filtered in each layer.

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