I just move from Vancouver BC , what up with Marysville
dogman69 Reviewed by dogman69 on . CO2 anyone? I'm hoping someone could step forward and tell me what differences it would make in my pals growroom. He is not computer savvy and asked me to find out. Room is 20x8 with a 7 ft ceiling. It has 4 1000W for flowering. From what I have heard, It doesn't increase yield, it just grows them to maturity quicker. Is that correct? Would the room have to be airtight? Any info will be appreciated. Wallhofen Rating: 5