I have been brewing for almost 3 years, and AG for over 2 of those 3, but I recently racked 5 gallons of a split Kolsch batch to keg, and the fermenter had a nasty looking biofilm in it reminiscent of an infection. Here it is in all of it's glory:
I didn't notice a film ontop of the beer, nor any type of pellicle in the beer whe I racked.
This was a split batch, and the first 5 gallons was racked to geg over a month ago, while this one sat in the fermentation chamber for another month or so. Unfortunately, I found a ass-load of black mold in the ferm chamber when pulling this batch out, and have since them cloroxed the hell out of it (guess I need some Eva-Dry), any ho, I dunno if that could be part of the problem, if it is a problem.
I recently started using clear plastic carboys opposed to pails, so I simply may not have noticed any film beforehand. any advice, or explanations would be grateful.
I sampled the beer, and to me there isn't any sour twang, or nasty flavors, but my palette is far from refined.
Comments, ar surely welcome