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Generally green apple (acetaldehyde) is due to fermentation not being complete. Did you cold crash? Did you verify that your beer was done fermenting? It is strange that your fermenter builds up so much pressure, even with an airlock attached. Are you filling the airlock to the top or to the line? Too much CO2 will cause the yeast to slow down, which ...


I took the attachment back to the homebrew store and they replaced it and attached trhe replacement themselves. Since then I have used the bottle for several batches. I guess it was a defective gasket.

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