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I think I understand what you are all saying but maybe I can clarify what I meant. First I have a gate valve on the line, so I dont see why it could not be controlled the same way as an overflow or a normal HOB overflow and why I would have any harder of a time balancing the input/output with the return pump.
The (poorly drawn) airline at the top of the U would be attached to an airlift pump to continuously draw air out just like the CPR units I have seen.
It just seems to me this would actually be easier to maintain than a HOB and be a better equivalent to a drilled tank overflow.
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