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Carbon dioxide generator for home carbonation

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I'm trying to build something like this:


Basically, you make a bottle with a tube coming out of it and you fill the bottle with yeast and sugar (or maybe vinegar and baking soda) and capture the resulting carbon dioxide. I've done this, and I added a pressure gauge, but I'm finding almost no C02 pressure. I can't tell if this is because my rig is faulty, or if I don't have enough feedstock to produce enough CO2.

Has anyone tried anything like this? Is this a viable way to make enough CO2 for a few liters of seltzer a week?
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