Since last week I’m using bigger fermentation vessels (270Ltr) and had bad luck with it.
The first two vessels (those where 200Ltr) I had to toss, the smell was very bad.
I thought that it was the material the vessels where made of and bought the new ones which are blue outside and white inside, food graded with a big lid.
Well, yesterday I made two runs on the Apollo still and was really disappointed with it, I ran from the heads direct to the tails, at no moment I liked the taste/smell of the likker, I always had a little acetone smell.
They are still airing out and I hope that I can use it for a vodka run on the bok.
I had some emails with Dnder and we are with the opinion that the heat produced (about 33C) by the yeast in bigger vessels can be one of the reasons that the taste/smell changes.
I will try another vessel made out of SS. It’s 230 Ltr and only 55cm diameter which will give a better cooling effect than the 80 cm plastic vessels.
Also will go back to old fashion baker yeast.
Did someone try Strands whisky yeast? Ian Smiley talks in his book about it, that was why I tried it.

What have been your experience on UJSSM with that yeast type?