i am just worried about it being really loud. Right now with the 1" U tube i made it is extremly loud and gurgles, even with a cap on the back. From what i can see my drain system is way to fast for my pump. If i fill the system up it will drain to my sump faster then my pump can pump it back. I am hoping that this return box will be nice a quite and not flow so fast that my pump cant keep up with it. Currently everything is working fine but that is only because the water level has dropped to about 1" above the pickup, this makes it so my pickup gurgles and sucks some air in, keeping the drain balanced with the pump. If i fill the level 3" above the pickup, it will just drian right back down to 1" above the pickup and gurgle air and water. It does hold steady and never moves from that 1" but it is very noisy. I might put a ball valve on my pickup tube to slow the flow down if this box flows to much to the sump. how does everyone get there system dialed in so the drain flows the same as the pump.