The yield of a rapid gravity filter as compared to that of slow sand filter, is
A. 10 times
B. 15 times
C. 20 times
D. 30 times
Answer: Option D
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The yield of a rapid gravity filter is much higher than that of a slow sand filter
Slow sand filter =about 2–6 m³/m²/day
Rapid gravity filter =about 120–150 m³/m²/day