railway RRB JE (CBT I + CBT II) Mock Test 2024 Environmental Engineering Water Treatment Filtration

Which one of the following is the correct sequence of Slow sand filter (1), Rapid sand filter (2), Pressure filter (3) in the decreasing order of their filtration rates?

1
3 > 2 > 1
2
1 > 2 > 3
3
2 > 3 > 1
4
1 > 3 > 2
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