Could you make it sort of like a herbie, put a gate valve on one drain to control the flow, (which would eliminate the draining/sucking siphoning noise) then make the other drain about level with the top of the water (in case something blocks the gate valve, you still have an emergency drain)? Does that make sense? We have a herbie style with our overflow box, and the only noise we have is the water falling from the box to the level that we keep the water in the box. You probably wouldnt have any noise at all.
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