Question :
Consider the following statement
1. The slow sand filter is not efficient in removing turbidity
2. The slow sand filter has a high initial cost
3. Skilled supervision is required in slow sand filter
Which of the above statement is/are correct?
1. Only 3
2. 1, 2
3. 1, 2, 3
4. 2, 3
Answer :
2 - 1, 2
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