Finally I find someone who knows what's up. I've ran completely sealed grow rooms enriched with CO2. While the yields are still good this way the hybrid CO2 enrichment with air exchange works better. You get bigger nugs and more weight. I don't know the science of why this is but I can tell you from experience of doing it both ways and my best results have been using both CO2 enrichment and air exchanges. My og kush plants thrive this way. For example when I ran CO2 in an enclosed room that uses a scrubber to clean the recycled air, I would average around 2.3-2.5 pounds per gavita fixtures. The nugs do get dense but not very big compared to the hybrid system. When I enriched with CO2 with air exchange I started hitting 3+ pounds per gavita fixture. My og kush nugs were bigger and did not rippen so quick. All my buddies that are getting over 3 a light are doing the same. The completely sealed grow room environment enriched with CO2 with no air exchange is an inferior technique to the hybrid system. 1st photo is the the top bud of my og strain using the hybrid system. The second photo is a top nug of the same og strain with no air exchange running CO2 in a sealed environment where the air is recycled and only scrubbed.
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