I actually like the design of the Berlin Turbo, and it's quite effective, just does not seem to work consistently for us, seems like one day it'll pull a lot of crud, then not even produce any foam in the top tube for a day or two. Doesn't seem to matter if its just been cleaned or let go for two weeks without cleaning.
BTW It's located in the sump with the base submerged about 6-7 inches. I've tried raising the sump level but that has had little effect. I have the pump running wide open and the air mixture closed up to where the micro bubbles are right to the bottom of the 2nd pathway (down). If i turn down the pump it'll barely pull any air in.
Any ideas on improving it's effectiveness or efficiency? Thinking maybe closing off one of the exit ports and/or increasing the head pressure with a length of 3/4" hose. I know some of you folks have the same unit ...how's it working for you?