I have a heat problem in my grow, so I figured I could grow with added co2. I'm broke most of the time lol, so I made one of these; How to build a Cheap CO2 generator - Stoner Forums - A Marijuana & 420 Friendly Community. Increased co2 allows the stoma to stay open during high heat 80F+. My plants love it, I have three generators for an average sized closet.

P.S.sorry about posting about another website.