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BroScience101
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I run a sealed room also and its not your soil making the majority of the co2 its the plant respiration. Take plants out of your living soil and test it... you will see next to nothing. I wouldn't bother with co2 either. To truly take full advantage of co2 you do need the lighting to do so. Honestly if you don't feel its worth it you aren't using it right. But you will see a benefit however if its a cost vs gain then I agree it's likely not as beneficial in your grow as it could be and probably not worth for you.
Now in @Dirtbag situation its probably similar and in order to see the full benefits he would need to seal and increase the lighting to see the full potential of co2.
Like I say its a cost vs gain... in hydro where growth is already amped up that 20-30% increase is huge... living soil definitely not as much but should be seeing a gain from it
Jeez man. What's your issue? Would it feed your ego if I simply said "everything you think and say is correct and everything everyone else thinks and says is hogwash"?
I had 3000+ppm co2 with just the living soil. No plants. Not even lights on. I mixed the soil, put it into containers, and stuck it in the room while I waited two weeks for my clones to root. I would check every day on the soil and the room. And that's when I was like "this is out of hand" and had to start venting the inactive room because of the soil. This continued even after I planted the clones. Only when the clones where finally in their second week of veg and a lot larher with a lot more leaves did the co2 start going down.
But dude, I'm not into this whole back and forth thing with strangers on the internet. Your grow room far exceeds mine. As does your knowledge. And LEDs are king. Please stop now