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-   -   Kombucha in stainless corny keg? (http://www.homebrewtalk.com/f167/kombucha-stainless-corny-keg-313626/)

DakotaPrerunner 03-16-2012 06:38 PM

Kombucha in stainless corny keg?
 
Hello,

My brother would like to brew a first batch of Kombucha and asked me if he could use one of my corny kegs to do so. I use the corny kegs for brewing but have seen that most people suggest staying away from stainless and using glass instead. Could anyone here expand on this?

Thanks for your help.

ChessRockwell 03-17-2012 05:20 AM

I'm not going to be too much help on the "why" of it, but I know you definitely want to stay away from anything metal when brewing kombucha. Do a quick google search on kombucha culture and metal and most sources tell you it's a bad idea. They even say not to use metal utensils or let anything metal touch the mother culture, so brewing in stainless would probably end badly. Maybe someone else can expand on why, but the short answer is you probably don't want to try it.

DakotaPrerunner 03-17-2012 05:46 AM

That is what I have seen looking around the web. It appears to have something to do with the low pH during fermentation. Metals and plastics can leach. Now looking for a glass container...

bottlebomber 03-17-2012 05:56 AM

I'm not sure if stainless would be a problem. I can't think of why it would be. Stainless is basically inert for most intents and purposes. Now aluminum I can see, and when it comes to Internet "knowledge" I can see how aluminum being bad could translate to "don't use metal". But as far as the steel leaching I don't see this being a risk. Since it will not corrode appreciably while the kombucha is brewing there is no way that there will be a transfer. If there was, steel wouldn't be so popular as a food safe material.

Vance71975 03-17-2012 12:42 PM

It could pit the stainless steel just like you can pit it by storing Star San in it for an extended period of time, and if it gets pitted it can ruin the keg and make it so that it wont hold pressure. I use a glass sun tea jug with a spigot on it, makes bootlegging a breeze!

bottlebomber 03-17-2012 02:47 PM

I don't think that kombucha has anywhere near the acidity of Starsan...

Vance71975 03-18-2012 02:05 AM

Quote:

Originally Posted by bottlebomber (Post 3901998)
I don't think that kombucha has anywhere near the acidity of Starsan...

it doesnt but extended storage of any acid can pit stainless.

ChessRockwell 03-18-2012 03:52 AM

Quote:

Originally Posted by bottlebomber (Post 3901998)
I don't think that kombucha has anywhere near the acidity of Starsan...

Maybe pure starsan, but by the time you dilute it to their recommended levels I'm guessing it would be pretty similar. Kombucha is quite acidic. I could be wrong, I definitely haven't taken PH tests of starsan after dilution... but you're adding only 1 1/4 oz starsan per gallon of water so that has to bring it down quite a bit.

bottlebomber 03-18-2012 05:05 AM

I'm going to have to take a PH meter to some kombucha now

Vance71975 03-18-2012 10:59 AM

Quote:

Originally Posted by bottlebomber (Post 3904115)
I'm going to have to take a PH meter to some kombucha now

Let us know exactly how acidic it really is, i know it can be sour as all get out, but that doesnt mean its a super strong acid since it doesn't eat your skin off lol.


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