The whole “put a bucket with wood chips” is a joke. You will get more co2 out of breathing in your tent daily. Let alone attract pests, or bring them in that way.
Have you actually ever grown cannabis before? This sounds like Facebook or growweedeasy type of stuff to me?
Inexpensive (free). As long as it's sterile, I'll give it a shot. Like every adjustment/addition, I anticipate having to resolve initial hiccups/Monday morning-quarterbacking. Rate of decomposition (i.e., practicality/effectiveness) and ventilation are concerns for sure.
Recently, I added fans in both tents; the steady breeze alone should add CO2 somewhat, I'd hope. Trust but verify. I'm buying a CO2 monitor and will test in both rooms, under different conditions:
1) no fans (for one day),
2) fans only (after a day, after a week),
3) fans and wood chips (I'll measure once a week until bloom's over, next time from Day 1; how long until I noticed a bump; how long until I needed another bump).
What did it cost me? I also like that it allows me to do something organic since I grow without soil, in salts. Gotta admit, my full-line of GH products is money down the drain even if it works great -- it only works once....
Complete section on Air from Marijuana Horticulture - Indoor / Outdoor Medical Grower's Bible by Jorge Cervantes.
www.kindgreenbuds.com
Compost and Organic Growing Mediums
Decomposing organic materials like wood chips, hay, leaves, and manures release large amounts of CO2. Although you can capture CO2 from this decomposition, it is most often impractical for indoor growers. Piping indoors the CO2 and fumes from a compost pile is complicated, expensive, and more work than it is worth.