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DIY CO2--Control of Amount?

Discussion in 'CO2 Enrichment' started by EllenOC, Mar 19, 2009.

  1. EllenOC

    EllenOC Junior Poster

    Feb 20, 2009
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    Can anyone tell me with DIY yeast CO2 production, what controls the amount of CO2 produced? Is it the amount of yeast used, the amount of sugar used, the size of the bottle used for the mixture, etc.? Thanks.
  2. Henry Hatch

    Henry Hatch Guru Class Expert

    Aug 31, 2006
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    The amount of yeast used, temperature, and the size of the bottle will affect the amount of co2 produced. Of course using a larger bottle means more yeast and sugar need to be added. The amount of sugar affects mostly how long the mixture will last. As the ethanol levels increase that is toxic to the yeast and will kill it.

    The trick is to find a reasonable combination of yeast and sugar which will produce a mixture that will last for a while and produce a fairly steady level of co2.
    One of the biggest problems with diy co2 is the stability of the co2 levels. Plants like stable levels of co2 in the 20-30 ppm range.

  3. shoggoth43

    shoggoth43 Lifetime Charter Member
    Lifetime Member

    Jan 15, 2009
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    The type of yeast used will also affect how long your mixture will produce CO2. The brewing yeasts seem to be more resistant to alcohol so they last longer. They are a little harder to find and a bit more expensive. I typically toss one of the bakers packets in with two cups of sugar and add enough water to reach the top of the label on a 2 liter bottle of coke. It seems to last around a month. I'm not at all sure how stable the CO2 levels are though. If you really want to give it a go, I'd use two bottles off a "T" and alternate swapping one out every two weeks.


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