Went to Bottle a cider yesterday and found it had a pellicle on it. It was 8 months old and 0.998. Had an obvious Brett flavor to it. I bottled it. Tastes 'OK', not what you expect from a cider. It was only 24 bottles.
Not sure what caused it. I have used a similar fermenter for an all-brett cider before, and it might have been the same container. I've tossed it now. I have recently started writing an S on the side of any plastics that have been used for Bretts or Sours.