I recently brewed a pale ale, 100% 2 row, ~13*P, hopped to about 40IBU with Azacca, and fermented with Voss Kveik at around 30*c. I ended up with an awful hose water flavour, which I can only assume is chlorophenols.

I have had this flavour only once before, about 5 years ago, on a different brewing rig, with entirely different ingredients. I'm confident in my sanitation, and as I haven't had this issue before with this setup, I'm confident in my water, as well as my process.

In addition, I also made a stout the same day, immediately after the pale, and it shows no sign of this flaw. To make matters even murkier, the flavour seems to have diminished greatly after about 3 weeks in a keg.

Does anyone have any thoughts as to what might have happened?

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    What is your water source? If its municipal/town water supply the levels or chlorine or chloramine can sometimes spike due to water quality or maintenance issues "upstream" of you. – brewchez Jun 11 '19 at 12:07
  • As I mentioned, I haven't had this issue for many years, and brewed another beer on the same day, ie with the same water, with no issues. It is municipal water, but as far as I'm aware my city doesn't use chloramine, and the water for this beer had sat overnight, so should have been prettu good on the chlorine front. The other beer should have been worse. – Frazbro Jun 11 '19 at 12:10
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    I don't think the Chlorophenols would come from any other source than water. But the second beer being clean is interesting. Did you use the Kveik strain on the stout too? – brewchez Jun 11 '19 at 12:16
  • I haven't brewed with Kveik yet. But I've had a handful of commercial beers with it. What was the source of your Voss Kveik? – brewchez Jun 11 '19 at 12:17
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    That was my thinking as well, I so haven't heard of chlorophenols diminishing. The stout wasn't with the kveik, it was with an English strain (don't recall off the top of my head). I'm sort of wondering if this is something that seems like, but isn't, chlorophenols. – Frazbro Jun 11 '19 at 12:18

Chlorophenols do not diminish, therefore you have some other contamination issue.

I would always treat my water from the tap with Metabisulphite to knock out any chlorine just to be sure, as presence of chlorophenols is grim, and unrecoverable.

My first guess would always be sanitation, I have been doing this years and every so often something will slip through the net. Now that I have PAA this is much rarer.

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