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Pressurized CO2 with solenoid and pH probe


I'm looking for a good diagram on the web of a good set-up for a pressurized
CO2 system using a solenoid controlled by a pH probe. Hoa has a good diagram
of his system, but it doesn't include solenoid and probe. I figure that if
I'm going to go through the expense and hassle of building a DIY pressurized
CO2 system, I might as well go all the way.

Can anyone point me to a good diagram?