Sweettoothbear - I would have thought that your setup would cause the Durso to 'burp.' So far fo me, if I don't allow for free flowing output on the sump end of the pipe it backs up and settles into a steady burping/flushing situation. I realize your flow is not obstructed, but I was thinking the loop would cause enough resistance to bring the same result. I guess once the flow gets established through that loop it flows freely.
I like it! And it looks easy enough that even I can give it a go.
Thanks.