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Old 08-06-2012, 10:35 PM   #1
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Lately I have been adding pottasium metabisulphite to my musts prior to fermentation but I was wondering is this really neccesary when using frozen concentrates? I dont think yeast or bacteria could tolerate my deep freezer. What I was going to do was just let the must get down to a pitchable temp and pitch the starter? Anything wrong with this?

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Old 08-06-2012, 10:52 PM   #2
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Lately I have been adding pottasium metabisulphite to my musts prior to fermentation but I was wondering is this really neccesary when using frozen concentrates? I dont think yeast or bacteria could tolerate my deep freezer. What I was going to do was just let the must get down to a pitchable temp and pitch the starter? Anything wrong with this?
No, it's generally not necessary although wild yeast could probably survive in your freezer. Often frozen concentrates have sulfites added as a preservative anyway.

Sometimes, though, just while the juice thaws and before the yeast starts fermentation the must may be susceptible to contamination. It won't hurt to use k-meta as a safeguard, but you may be perfectly fine without it as well.
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Old 08-07-2012, 01:32 AM   #3
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yea, this juice does not have any preservatives, and I did think about the wild yeast thing, I may go ahead and still use it. I was just trying to kill some time off my next batch...thanks

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Old 08-07-2012, 08:36 AM   #4
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Its a good idea to do it.

I've been known to skip it with frozen concentrate batches.

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