Oh, I'm not worried at all. It works like a charm. And yes, the two open drains can take the full flow each, even as open standpipes sucking air.
I'm not really sure I follow all the down turned sanitary tees in the Beananimal. The second drain, the one I left open would act the same as far as I can tell. Maybe it's a touch quieter with the pipe being under water. I suppose you wouldn't hear the trickle as much. Besides that though, mine flushes just the same if the flow totally plugs the second drain. Just like the Beananimal drain flushed when the airline is underwater. I'm not sure that the difference in sound warrants all the extra piping. My first and third drains are essentially identical. My first is open pointing up, but running at full syphon so there's no difference if you have it down turned, and the third is just open.
The only huge difference between mine and the Beananimal is the ability to use a ball valve on the BA because you don't need to be very precise on the second drain as even with a bit of extra water it masks the sound (being under water). My gate valve is precise enough that the trickle is so small in the second drain that it is silent, or I get it adjusted perfectly and the water level floats just below the second drain, but also doesn't fall to the height of the full syphon. I'm sure the gate valve would be cheaper than all the tees and airline connectors, plus less room is needed.
Agreed that the Beananimal is a fantastic system. It's just bulky and harder to build than three sticks of pipe.
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