Late to the party, but I agree, no teeth and Beananimal. You don't need to get all fancy with the Beananimal though... I set mine up like a Herbie. One drain fully submerged about 1/3 of the way from the top of the OF, another open standpipe at the waterline you wish to maintain, and the third open at the MAX ever water line. You just have to test that the open standpipes will handle the entire flow if it ever gets to that point. Mine handled it no problem so I can't see the reason for the sanitary tees, air line, and the "flush" feature.
I'm also not sure how it happens, but my system finds this balance where the main drain is full syphon and the water ISN'T trickling down the open standpipe. It just floats in between... meaning it's a perfect balance. I though the water would eventually drop the the level of the main drain, or increase to trickle down the open pipe, but it hasn't in days.
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