Optimal CO2 levels recommended by experts to increase Cannabis growth and increase yields in grow rooms.
www.co2meter.com
There is a section on grow bags......I do that thang , however I do get tired of hyperventilating and passing - out . I should hire some young kids with a good set of lungs to do this dirty deed .
Lots of anecdotal claims pro and con, but I didn't see anyone who did head to head grow reports where the only variable was CO2 bags.
OTOH I've seen the results of a controlled environment with regulated atmospheric conditions but that's a $7.5M grow room. Even for them it's probably overkill because they'd have commercial quality results anyway.