Question :
Consider the following statement
1. Slow sand filter is not flexible in variation in demand
2. The rapid sand filter is flexible in fluctuations in demand
3. The method of cleaning of a slow sand filter involves agitation and back-washing
Which of the above statement is/are correct?
1. 1, 2
2. 1, 2, 3
3. 2, 3
4. Only 3
Answer :
1 - 1, 2
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