Q9 of 27 Page 93

In a filtration, plant water is filtered using layers of

The sand, fine gravel and the medium gravels are used to filter as they form a layer so that efficient filtration takes place.

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7

The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as

 8

Which of the following is a part of inorganic impurities of the sewage?

 10

Which of the following is not a source of waste water?

 11

Why are open drains a concern?