this is what I found on google.
Ensuring that the air in your room is exchanged every 5 minutes or less and having an oscillating fan in your area to move fresh air will replinish the layer of CO2 that naturally resides around the leaf surface. This is one of the most beneficial ways to intro CO2 into your system.
Like Shaman, I'm not big on misting either. The misting w/plain water thing has always escaped me. There's no need..and it promotes diseases, IMO.
With that said, I do, however, occasionally foliar feed with Metanaturals Nitrogen in veg...and then Nitrozime (0-4-4) in flower. This grow also adding in some AN Scorpion Piss...again at the rec of a friend. Many feel foliar feeding w/ a kelp based formulation increases harvest yield. Um...it can't hurt..so I go for it.
The ONLY other time I mist is to look for spider mite webbing.
I'm also not big on the "home" CO2 yeast set up. whatta mess...and who can prove benefit?
MOST growers will be better off spending their time wotrking on VENTILATION or other aspects of the grow rather than making scant amounts of CO2 via a bowl/bucket of smelly yeast mix.
CO2 is highly beneficial, but I doubt those home systems can come ANYWHERE near a tank/regulator set up or a propane generator....and they sure aren't monitorable or controllable. In the end, the user has NO IDEA how much CO2..if any..is being released into their garden using the home-yeast method. With a tank/reg set up or a generator, the OPTIMAL amount of CO2 can be introduced...no guessing..no mess...no foolin yerself and wastin time.
seltzer water is a waste of cash. Don't bother. Spend the time TWEEKING yer room in other ways is my advice...and skip the home remedies and myths.