Is mold an issue with Soda? - Home Brew Forums

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Old 04-27-2011, 06:16 PM   #1
Apr 2008
Frederick, MD
Posts: 546
Liked 2 Times on 2 Posts

I'm just getting into Soda, haven't decided if I'm going with carbonated water and syrup in a pump for each glass or just mix a keg at a time of soda.

How long does a keg of carbonated water last before mold becomes a problem? Are there any additives I could use besides ethanol to extend the life?

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Old 04-27-2011, 08:01 PM   #2
yogensha's Avatar
May 2009
New Mexico
Posts: 195
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I just carbed a keg of RO water to start experimenting with mixing syrup on the fly and was wondering the same thing. I sanitized the keg as usual, boiled the water for a couple of minutes and added it to the keg hot to discourage any growth. Soda water is also acidic, since CO2 dissolved in water forms carbonic acid:

For a CO2 pressure typical of the one in soda drink bottles ( ~ 2.5 atm), we get a relatively acid medium (pH = 3.7) with a high concentration of dissolved CO2.
That should discourage most spoilage organisms and molds.

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