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Don, I built a unit that is very similar and put it into service about 3 weeks ago. 4" pipe for main body, tapering to 2" at the top. A large AES diffuser for the stone and T'ed it into an existing air pump. Used 2" for overflow and waste.
So far not a damn bubble has come out of it. I mean nothing. I can hear it churning almost like a belching coming from it but no bubbles. If I turn up the air any more it pumps water out big time.
I'll try tweaking the placement of the unit and maybe cutting some air since I can't add anymore or else it acts like an airlift pump.
Any tips to get the foam?
I did notice that my return overflow was lower than yours, so I raised it. We'll see what happens tomorrow.
BTW Did you have problems with surface foam to start with? I did not but just like to tinker around. Maybe my DIY TT's are rendering this unit inoperable?
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