Quote Originally Posted by Vancefish
Plants stop growing all together at 200ppm and lower. They slow a lot at anything over 1300ppm. So, most people aim for somewhere around 1100-1200ppm. However with no automatic sensors MANY people just do timed release of small doses of CO2. Ambient CO2 world wide is anywhere from 250ppm-350ppm. PLUS CO2 weighs more then regular air. thus FANS are needed to keep it up off the floor.

In a sealed room the yeast thing will fill up the room. YES it does work.

156 plants?? WOW. Little bigger then I assumed.:jointsmile: I'm in Colorado, US. With my 4 care takers, I can have a total of 24 plants!:wtf:

For that much space you'll need a lot of fans and a lot of kerosene lamps!
I'd suggest a natural gas CO2 generator. You can have it connected directly to your house/buisness's heating gas line and generate CO2 in MUCH larger areas. plus you don't have to haul fuel.
I am only going to gas the 43 I have in flower right now as a test and work out the kinks as I go along. When I get the donations from the growing I will be able to afford a CO2 generator. My problem is we are out on a farm and do not use natural gas we use coal oil or heating fuel. I use diesel as it is cheaper, and my main grow room is 20 x 16 x 8 and the other room is 16 x 12 x 8 all wired with 220 and ready to go ahead, once the Govt changes the Law again in our favour I hope.
Anyway thank you for the help and will keep you posted.

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