So last week I made a couple 1.5 liter starters for two packages of Wyeast 5335 destined for two 5 gallon carboys of Berliner wort. Lacto were pitched to ~1.025 starter wort at 95*F and held at steady temp for one week. During that week one of the starters was producing a very small amount of gas bubbles. I didn't think much of it. Prior to pitching the starters, they were sampled and pH tested. Tasted nice and sour with pH of 3.5. Into the fermenters they went to fresh un-aerated wort at 1.034 and 100*F. Just a couple hours later, the carboy that received the "bubbly" starter erupted into what I can only describe as a classic, vigorous yeast fermentation. Lot's of gas, churning beer and lot's of krausen that blew out the foam stopper and had to be replaced with a blowoff hose. I decided to just clean it up and let it ride for the planned week at 100*F. The second carboy is nice and quiet and fairly clear compared to the other, as expected.
Anyone else experience this with a packaged lacto culture? I'm assuming I received a packet contaminated with yeast of some kind. My sanitation is solid and likely a bit over the top. I've never had to dump a batch at home due to contamination.
Any thoughts on the "infected" carboy. I made my starter of 1007 for the clean batch last night. I decided not to make the second one for the "infected" carboy as I'm pretty confident that it's fermented out into a hot fusely mess. I'll do some taste tests this weekend to see where its at but I'm not terrible confident. Oh well, at least half of the batch should turn out well. Appreciate any thoughts or comments folks may have with similar experiences.