In a rapid sand filter, what is the required depth of filter media?

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Multiple Choice

In a rapid sand filter, what is the required depth of filter media?

Explanation:
In a rapid sand filter, the depth of the filter media is chosen to balance how well particles are removed with how easy it is to clean the bed. If the bed is too shallow, there isn’t enough surface area and path length to trap solids, so filtration efficiency drops and smaller particles can pass through. If the bed is too deep, flow through the bed becomes more restricted, increasing headloss and making backwashing more energy- and water-intensive, with diminishing returns on removal. A moderate, standard depth provides enough contact and pore space to remove suspended solids effectively while keeping flow and backwash requirements manageable. That’s why this mid-range depth is the best practical choice among common options.

In a rapid sand filter, the depth of the filter media is chosen to balance how well particles are removed with how easy it is to clean the bed. If the bed is too shallow, there isn’t enough surface area and path length to trap solids, so filtration efficiency drops and smaller particles can pass through. If the bed is too deep, flow through the bed becomes more restricted, increasing headloss and making backwashing more energy- and water-intensive, with diminishing returns on removal. A moderate, standard depth provides enough contact and pore space to remove suspended solids effectively while keeping flow and backwash requirements manageable. That’s why this mid-range depth is the best practical choice among common options.

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