Quote:
Originally posted by redfrogtango
I agree. The cross-sectional area of all those holes in the pipe is clearly much, much greater than that of the 3/4" bulkhead - yet 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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I should clarify. The fact that the pipe is completely underwater suggests to me that you are relying on at least some head pressure, generated by the water height of the tank above the bulkhead fitting, to help force water through the bulkhead fitting. I suspect that you will get a quiter flow (particularly with the vent) if you dial back your pump a bit. My suggestion to cut it by 1/2 was probably an exageration.