So my flow meter seems to work to some extent. I ended up having the bubbles go up through a tube of water before going through the flow meter, this means that the bubbles take some water with them, which helps spin the wheel in the flow meter at an even lower flow. The design also makes it so...
Yeah, that does seem to be an issue. Mine is rated from 0.6L/min on up. Should be fine at the start of fermentation, but towards the end it would not be enough. One option would be to get some sort of pressure dump valve. Builds up pressure to a certain point and then dumps it before closing and...