1.

What_is_the_height_of_the_anthracite_maintained_in_a_dual_media_filter?

A. 1.5-1.8 m
B. 2.2 -2.4 m
C. 2.5-2.8 m
D. 2.8-3.0 m
Answer» B. 2.2 -2.4 m


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