Regarding for the width, I think you should consider the location for the flume (filter influent and filter effluent collection box) and the backwash trough layout. The max. distance between each trough shall be less than 2 meter (or 6 ft in the U.S.). Your 3.9 meter is perfect for 2 trough layout if you put your flume at the end of the long sidewall.
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我设计的滤池有的面积只有几平米。