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Recurring acetaldehyde problem with extract NEIPA brewed with S-04

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Latest batch turned out great :)

It was a "grapefruit IPA" extract kit with dry hops, using M44 yeast (which I believe is just repackaged BRY-97).
I used RO water and fermented at 20C for around two weeks before adding dry hops.
Fermentation was done in a stainless pressure fermenter, which was cleaned with sodium percarbonate and sanitized with both starsan and boiling water.

I noticed a bit of strange sweet aroma when I took a sample before dry hopping, but it seems to have faded a lot after cold conditioning and it tastes fine. Maybe something to do with the grapefruit flavoring added to the extract.

Once this batch has been consumed, I plan to try again with S-04 and US-05 and see what happens.
Hey man! Reviving this thread!

Did you even get this all behind you?
 

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