that's right, water would only flow into it if there was a problem with the main. Realize bit of waste of space in the display having basically an empty overflow.
If was really ambitious guess could remove the overflow altogether. What would be visible would be the drain standpipe (keep about the same height as now) and the pump return line (would need to support), would gain about 5g. Negative would be if there was a problem with the bulkheads could be wet, but then I'm not worried about the CL returns.
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