TEEX Basic Water Works Operations Practice Test

A common filter is the slow sand filter, having several layers of differently sized media.

It has only one layer It uses activated carbon True False

Correct Answer:

False

Explanation:

Slow sand filtration relies on a bed with multiple media layers: typically a coarse gravel base beneath a finer sand top. The gravel supports the bed and creates large pore spaces, while the sand layer traps smaller particles as water passes slowly through. This arrangement also supports a biologically active layer at the surface that helps remove organic matter and microorganisms, enhancing filtration. Activated carbon isn’t a defining feature of this type of filter. So the statement about slow sand filters having several layers of differently sized media is true.

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