Which of the following statements are correct pertaining to the value of uniformity coefficient Cu for filter sand?
(1) For slow sand filters, Cu = 1.8 to 2.5
(2) For rapid sand filters, Cu = 1.3 to 1.7
(3) For slow sand filters, Cu = 1.3 to 1.7
(4) For rapid sand filters, Cu = 1.8 to 2.5
1
2 and 3
2
1 and 4
3
3 and 4
4
1 and 2
5
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