7
Which of the following is not commonly used as a filter material in the treatment of water?
EXPLANATION
Soil Water Dynamics
- Water Filtration Media:
- Municipal and industrial granular bed filters utilize high-purity silica sand, crushed anthracite coal, and dense garnet sand to construct single-media or multi-media dual filter beds.
- Crushed rock is too coarse and irregular for fine granular filtration, being reserved for biological trickling filters and drain packings. (Correct answer: Option 2)
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