Quote:
Originally posted by Daemonfly
Also, it seems that the flow is too high for what you currently have designed there. Water shouldn't be over the pipe completely.
Once you put a proper vented durso in the back, this problem may just correct itself though.
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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).