The effective size of sand particles used in slow sand filters is – McqOptions

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1.	The effective size of sand particles used in slow sand filters is
A.	0.25 to 0.35 mm
B.	0.35 to 0.60 mm
C.	0.60 to 1.00 mm
D.	1.00 to 1.80 mm
Answer» B. 0.35 to 0.60 mm

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