Co2: No idea where to begin. Kits?

[rebe]

I am shocked at the prices you must pay! In order for the Milwaukee solenoid to work with your existing parts, you have to find the parts required to connect it to the dual guage kit:

View attachment 364318

The parts, if available to you, may not be that expensive.

I am not that familiar with newer JBL products but, in your case, maybe it is better to go with the JBL in your second picture. You can skip the controller and put a timer on the solenoid to come on 2 hours before your lights in the morning and off an hour before the lights go off at night.

Provided you have a way to fine tune the CO2 flow rate, you could use the bubbles in the diffuser to monitor the PH with the test kit I mentioned or one of those stick on glass PH checkers.

Not the ideal but may provide something until you can find a reasonable Controller.

Good luck...Jim

Thank you very much, this is good advice!
Yes, the less main stream a piece of kit is in Ireland the more extortionate the price is.
It's because everything gets heavy tax travelling through the UK, which left the EU as I'm sure you know.
The demand for stuff like pH controllers in Ireland is very low