Toolman do you mean turn that little dial thats on the intake tube? I had it set so the flow was lower but the foam was coming up the tube wayyy fast so now returned it verticle and the foam is not quite foaming over the top of the tube. It should be okay while I'm at work right? I don't want it foaming so much that it overflows the collection cup. Before I turned the dial it was foaming so fast that I had to empty the cup twice today so far.