Quote:
Originally Posted by 04scoobysti
Usually I use a gate valve on the line from the overflow to the sump, and put it as
close to the sump as possible so i can tune the overflow and get rid of any unwated noise.
Most noise is just from too much air getting into the pipe.
My 2cents FWIW.
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Aha! There's an excellent theory!
Is the noise coming from the water falling over the overflow, or from the pipe to the sump? More water moving through the pipe = more air being sucked through with it, like scooby said. Also, do you just have a plain bulkhead, or do you have a standpipe attached? If the noise is from the water falling over, adding a standpipe will reduce the height of the fall, and therefore the noise.