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The effective size of sand particles used in slow sand filters is | |
A. | 0.25 to 0.35 mm [Correct Answer] |
B. | 0.35 to 0.60 mm [Wrong Answer] |
C. | 0.60 to 1.00 mm [Wrong Answer] |
D. | 1.00 to 1.80 mm [Wrong Answer] |