Water filtration rate in a slow sand filter ranges from ____________ litres/m2/hr?
Correct answer: D. 100 to 200
- A. 10 to 20
- B. 4000 to 5000
- C. 1500 to 2500
- D. 100 to 200
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.
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