A couple of months ago I had a third hand pull installed on the bar to have some guest ales on. All of the pipework was already in place, the only new section was between the cask and the gas pump.
It was cleaned thoroughly before using it, and when connected to a cask, it’s coming through fine and tastes fine. However, when left overnight, the beer gets a chemical like taste to it. I assumed as it was because it was a beer which I’d not worked with before, but I’ve since tried other brands on there and the same happens. As long as it’s constantly flowing it’s ok, and the taste of the beer isn’t impacted.
Again, I’ve cleaned it out thoroughly, both before, after and in between casks. When I flushed some water through the line and left that overnight, the same smell/taste came through that.
Any ideas what might be causing it, and what (if anything) I can try to do to solve it?