Anyone got any thoughts as to what this is (post 313)? It's reared its head again and im kinda pissed off. I cleaned the Fermenter 2 times perc then bleached the **** out of it, then flushed with fresh water, then filled with boiling water and then sanitized. Pored a kolsch in and it's back. Another 50L on the grass.
It's definitely sour but not overwhelming. It has definitely stripped the malt profile from the kolsch. I don't want to throw the fermenter but I dont want to lose another 50L batch. So far iv'e lost 100L of beer a filter and a heap of beer line.