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the geranium smell is from malolactic bacteria interacting with sorbate.
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thanks for the info, that makes sense.
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I would assume that sulphiting at a full dose would have knocked out the malo bacteria.
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yep, the batches that got a full dose of sulfite still had a taste from the sorbate, but it was much more tolerable.
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So I guess the lesson should be, if you plan to sorbate, you better give a full dose of kmeta.
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yep, sorbate without kmeta is really nasty. I've made some funky batches over the years but this stuff was not even pig feed grade. these were the first bottles I've dumped down the drain in years.