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Hi Darrell, if the air has ~400ppm CO2 currently why does the water only take up ~11ppm in a low tech (this is what it appears to be in the figure above)?

This is incorrect. If you have no solenoid your electricity consumption is zero (but as was said, you waste CO2). If you do have a solenoid then you use no electricity when it is off, but you do use electricity when it is on (but you do not waste CO2). Therefore it is not win-win with a solenoid...

Still running silently. We have exorcised the demons!

Update, the solenoid is running completely silent today, all day. Just one of those things I guess...

Well, opening the needle valve fully had no effect. But then again, the solenoid is still working properly, just loudly. Messing with the solenoid's position I have been able to reduce most of the annoying sounds, but it is very tempermental. At present the noise level is acceptable and not...

Thanks for all your inputs!

I should add the solenoid is still functioning properly at the moment.

I have a Wave CO2 regulator with solenoid which i purchased about a week ago from here; http://www.firststopaquatics.co.uk/acat ... noid_.html This is my first foray in pressurized CO2. Like an earlier poster here, viewtopic.php?f=37&t=9766, I began experiencing problems with this regulator...