The multi-media filter in many community water treatment plants is composed of v

Question

The multi-media filter in many community water treatment plants is composed of various layers of materials through which water is passed during treatment. The layers typically consist of gravel, activated carbon, and sand. Following backwashing, these filters are allowed to sit quiescently for several minutes while the filter material layers settle back into place. Based on your research of the specific gravity of each of the three materials, predict the sequence of layers that will finally result.

I have:

activated carbon

sand

H2O

Gravel wet

Any insight into if this is correct would be helpful.

Thanks

Explanation / Answer

Correct order would be : Gravels wet (for large size impurities) - Sand ( impurities escaped from Gravels) - Activated carbon ( for very fine impurities) ...

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