Water cooled Co2???

This what you're looking for? http://www.hydroponics.net/learn/co2_calculator.asp
Wow that's a big room! How many trees you got in there?

Thank you so much Bob! :lol: I've been wondering for so long and now I see that this burner will work. I'll just get a ppm computer thingy, air 3 controller, and the burner. Plug it all in, set it, and wolla!

In each room I have 136. 2 flower and 1 veg. I'm trying to get 200 in each room now because the strains don't grow as big as I want them to. Just gotta master the yeild on this new strain. Hindu Kush.
 
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