[toddc76]

Sure, So the return water from the main tank comes in through the the pipe you see coming in from the left. the water then pours into the 4" piece of vertical PVC you see there. Inside that PVC the water is breaking on a column of liverock rubble. This helps all the bubbles break and they air vents out of a 1/4" hole in the top of the tower. The water then leaves the tower through some teeth I cut in the bottom of it, think overflow teeth but upside down. I can try to take some more picture if you would like.

If you look in that picture above you can see very few bubbles from the return, and that is close to 1000gph going through there. Seems pretty effective to me.