wouldnt the vent hole need to be positioned toward the bottom of the setup just above the level of the perlite due to co2 being heavier than air? that way the fresh air would push the co2 out the bottom.
This is a great modification of my original design for a two chambered terrerium using 2-liter soda pop bottles with air circulation through the water layer using aquarium pumps which I developed as a prototype and which I submitted the designs for it to the owners of this board 2 years ago.. I have since implimented a bulk casing method which is exactly identical to this and it is a sweet system. I appreciate others insights into this and I had been using perlite which is messy and will switch to lavarock.
I consider this a hydroponic growing system by definition. And they say there aren't hydroponic mushrooms.
THANKS I GUESS GREAT MINDS THINK ALIKE !!!
JBB