I think I saw the same video Tomthehippie saw ("I Grow Chronic!"). There is a guy who is painted green and he shows you how to setup a quality grow room in a basement. He has HID lighting along with CO2 tanks, regulators, timers, the whole bit. He said:

"If I didn't have money for this" says green man talking about the CO2 system, "Well I would just use bubbly water and a sprayer, I can spray this on the plants and they will get CO2 all day long, actually, I do both."

He uses a CO2 system and a sprayer combined, just passing on a bit of info I came across about this subject:thumbsup:
Dr.Hashman Reviewed by Dr.Hashman on . Increasing yields with C02. How exactly does this work can someone explain why C02 helps so much, i guess in scientific terms. And I had a nifty idea for distributing it, my friend has a 20 oz. C02 tank with an on/off valve, so you can spray as much out of it out at a time as you wish. (funny as shit to blast people with when they're not expecting it) Would this be a sufficient way to get added C02 to plants, or am i retarded? Rating: 5