I think I found it!
Like many, I have a bucket collection.
I keep getting a recurrent lacto infection about half the time I brew.
(AG only, and I keg.)
Couple of weeks ago I took some vacation to watch the kids while SWMBO went antiquing with her sister.
I brewed 6 batches in 7 days, and found out which buckets have the lacto.
Well, after tossing out 3 AG batches in one week. (12 man hours wasted)
I have decieded to pitch all my plastic buckets and have ordered a couple of 6 gal better bottles to use as primary fermenters.
Does anyone use these? Do I need a blow off, or is 6 gal big enough?