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Originally Posted by mark
Went drilled returns myself but have seen a picture where the top of the overflow box's "u" is drilled and has a piece of airline attached with the other end of the tubing connected to a venturi port of a Maxijet sitting in the tank. Idea was air that might buildup in the top of the "u" is continuously removed and when power is returned (after an outage) the Maxijet is to help restart siphon. Couldn't see the Maxijet having that much suction but that was the concept.
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Yep, I have a cpr-style overflow that uses this concept and it works great.