Moderate
Water filtration rate in a slow sand filter ranges from ____________ litres/m2/hr?
Correct answer: B. 100 to 200
- A. 10 to 20
- B. 100 to 200
- C. 1500 to 2500
- D. 4000 to 5000
Explanation
Slow sand filters operate at a very low filtration rate, commonly about 100 to 200 litres per square metre per hour. The much higher rates belong to rapid sand filtration.
Written and checked by Zahid Hussain, MS Computer ScienceLast updated
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