co2 tank

for people that use CO2 supplementation... how much do you go through and in what amount of space? What do you have your settings on the regulator at? 1200 target and 100 zone is what I am at right now... is it normal for the meter to go all the way upwards of 2000 when it is running? any and...

So I'm considering switching to a sealed room this summer to help prevent sucking out my A/C faster than I can make it. I run an organic soil water only garden, and I would only be considering running CO2 at atmospheric levels for my room (probably have it ramp to 500ppm and shut off, and...