I really like my Shadow overflow, which has been running for several months. I'm just now trying to dial in the noise. I'm running the Bean method and have discovered where I can achieve silence by adjusting my gate valve, but it requires cranking down until a lot of water is coming through the secondary pipe. When the valve is too open, I get a whirling noise in the overflow that sounds like strong winds blowing, and the noise in the gate valve sounds like trickling water, though a lot of water is running through it. Then just before I reach silence in the gate valve, the noise in the gate valve sounds like a dishwasher. Once I close the valve just past that point, everything goes silent. I realize I'm supposed to mess around with the PVC lengths in the overflow, but I can't reach the back of the overflow because I'm handicapped. I could get someone to help, but if I can achieve silence by just adjusting the valve, that would be great. My understanding with Bean is that the water is only supposed to trickle into the secondary pipe. I get a little more than a trickle with the gate valve wide open. Obviously the more I close the valve, the more water that goes into the secondary pipe. My guess is, I'm probably closing the gate valve to where there isn't a lot running through it, but it does make things quiet. I realize the emergency pipe would have to take a lot of capacity if something bad happened. That said, is this normal and ok?