Margolis wrote:
"Nikki Casali" wrote in message
...


A controller will control - hence the name - the amount of CO2 dissolved
very precisely, usually within 0.1 pH, depending on hysteresis.





a controller will do that with a tank of pressurized co2, but I don't see a
practical use for a controller with diy co2. Somebody might figure out a
way though.


I think you would need a movable diaphragm where CO2 can collect whilst
the solenoid is closed. A balloon would do! Otherwise it's down to a
pressure release valve to ease the yeast bottle pressure. Yes, that
would be needed to prevent the diaphragm from rupturing anyway - pop!

Nikki