I’ve got a question or concern I would like help with. The last four all grain batches I’ve brewed, I have had a fermentation that will not quit. The air lock bubbles for 14+ days. My amber ale was at 16 days until I cold crashed it and it stopped. It still turned out good but the 16 days of bubbling in the air lock was not normal for me (OG 1.053, FG 1.008). My cream ale lasted 12 days but turned out great (OG 1.047, FG 1.002). My copper ale lasted 14 days until I cold crashed it…kegged it yesterday so have yet to taste it (OG 1.057, FG 1.006). I have a Kolsch that is still active at 10 days (1.044). I combined a brew and had a team brew lasted 5 days as I have experienced in the past. The only thing different between all of them is that I used a new counter flow chiller on the brews that bubbled a long time. Everything else is the same. My Team brew was chilled by an immersion chiller prvided by one of the team members.
I know that the length the bubbling occurs isn’t neccarily indicitive of fermentation, but taking a gravity reading is more exact. I have not done gravity readings due to fear of oxidation and contamination. What do you guys think is going on here? I’ve cleaned my counter flow chiller 2x with PBW and ran Star San through it 3x. I’m confused. All of my brews before this counter flow chiller, the fermentation lasted 5-7 days. Any advice?
Sorry to be so lengthy.