Hey Diamond, I installed my Eshopps nano overflow box today and it works like a charm. Its quiet and was easy to put together. The only tricky part is starting the syphon. I used airline tubing threaded up the U tube til I got to the curved part at the very top. Put it in where it goes and suck on it. The water that is in both chambers, ( which I had to fill) will go up both sides of the U tube until its full. The tricky part is retracting the airline tubing without taking the U tube out of the chambers with water in them. Eventually I got it out. I don't see any bubbles building up so I am not even going to use an aqualifter on this overflow. My other overflow has the U tube drilled with an aqualifter that always starts a syphon because bubbles would build up and I worried it could lose a syphon some time.