What happens to DIY CO2 bottles that run for more than a few weeks?
I'm sorry if this topic has been covered before. I'm wondering what happens if you leave a DIY CO2 bottle in operation for a month or more. If they are still producing bubbles, are the bubbles CO2 or does it start producing some other gas?
Re: What happens to DIY CO2 bottles that run for more than a few weeks?
The bubbles being produced are CO2; However, the byproduct of anaerobic CO2 production is ethanol. This substance is toxic to the yeast so the accumulation of this byproduct will eventually kill the yeast, ending your CO2 production. Most sources simply recommend changing your DIY CO2 bottle every 2 weeks because the CO2 production after this amount of time starts to decrease due to the death of the yeast from the ethanol.
Re: What happens to DIY CO2 bottles that run for more than a few weeks?
And if you take a tank down and forget to empty the bottles they really do not smell bad even after a few months.
I think they smell worse when they are just 2-3 weeks old (and something is still going on in there)
Re: What happens to DIY CO2 bottles that run for more than a few weeks?
I think it smells quite good ...just like alcohol....haha. Try leaving the bottle for a few months, maybe you'll get a bottle of beer. Don't blame me if you get intoxicated or poisoned to death for drinking it...hahaha. You wouldn't want to try this with milk though. I encountered the milk version due to the fact that I had a crazy curious housemate back in the uni days.
Re: What happens to DIY CO2 bottles that run for more than a few weeks?
Perhaps if you started with the yeast used to make champagne?
I remember reading a few years ago that an aquariust had a deal with the local moonshiners. He would sterilize everything and use their recipe, their equipment. He got the benefit of the CO2, they got the liquid result.
What happens to DIY CO2 bottles that run for more than a few weeks? 
Anyway, getting the license is not easy unless I migrate 
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