Quote:
Originally posted by redfrogtango
the pipe is still under water. Vent or no vent, you either have to increase the size of the bulkhead, add a second bulkhead, or cut down on the flow rate of your return pump (probably by 1/2).
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With out a vent this set up will "wait" to flow until a true siphon starts. Then when it did form siphon it sucks air in and breaks siphon keeping level at and above the drain holes. With a vent the drain starts sooner and stays consistent. He has had this running without an overflow therefore the pump might not be to to strong. I do agree though lower flow would make a quieter set up either way.