THE_THICKNESS_OF_THE_BASE_MATERIAL_OF_A_RAPID_SAND_FILTER_ON_WHICH_FIL – McqOptions

MCQOPTIONS

1.	THE_THICKNESS_OF_THE_BASE_MATERIAL_OF_A_RAPID_SAND_FILTER_ON_WHICH_FILTER_MEDIA_ARE_SUPPORTED_IS?$
A.	45-60cm
B.	20-80cm
C.	30-75cm
D.	10-30cm
Answer» B. 20-80cm

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Which device is used to supply air for the agitation of sand grains during washing of filters?$