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Is it possible to generate C02 with a hair dryer?
Use regular bread yeast, sugar and warm water ... fermintation releases small amounts of Co2 for like 2 weeks at a time.
LOL, nothing AF you keep the mixture in a bottle and run an air-tight tube out of the top and place it somewhere near the top of your grow room. Shake the mixture once every few days to stir it up. The yeast doesn't escape , only the Co2