"SlimFlem" wrote in message
news:QAIT9.3459$Dn.305@sccrnsc03...
One other thing I noticed. When I had media in the tube with the 301,
many
air bubbles formed around/in/on the media and never dissolved. I tried
rock, ceramic tubes, and plastic balls...same on all of them. Maybe you
will have better luck.

I have the same effect in my reactor. This happens because there might be
collecting some other gas (other than CO2) that doesn't so readily dissolve
in water as CO2. My guess is the effect is more drammatic if you use yeast
produced CO2 since there might be some side metabolic products.