i've used TNB and i liked it, but here's a simple recipe to make your own : https://www.420magazine.com/community/threads/diy-co2-generator.115134/ and here's a discussion on why CO2 might not work : http://www.jasons-indoor-guide-to-organic-and-hydroponics-gardening.com/co2-from-fermentation-sugar-and-yeast.html ... hope this helps bro ! 🚀
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