Planted Tank Guru
Join Date: Jun 2004
Location: Baton Rouge, LA
The first check valve on the bottle is unnecessary. As long as the yeast is still alive and fed, the bottle will be under positive pressure and that will prevent air from getting into the bottle.
I don't see the need for a safety "blow-off" either, as long as your reactor does not impede flow. If the solenoid fails in the closed position, all the CO2 will simply flow into the tank.
My main concern is with this turbo yeast. If it's as active, and short-lived as you claim, you will be wasting a lot, and having to change the mixture quite often.
Seems like a less wasteful and maintenance-intensive option would be to use regular yeast, and invert the output from the pH meter to turn on a heater for the yeast mixture when pH goes too high.