Process Experiment: Can you Ferment a Sour Beer and a Clean Beer Side by Side?

As previously noted in my sour beer post, I love sour beer. After brewing my first sour, and doing a little sample, I was freaking stoked! I could not believe that I had produced something even remotely similar to the sours I’ve enjoyed over the years. With the knowledge that I wasn’t going to be able to enjoy this beer for another 6-8 months, I figured it was time to brew more sour beers so I would have a steady supply sometime in the future. I didn’t want to sacrifice my fermentation chamber for another three weeks at 80 degrees to get 5-10 gallons of beer that would be ready a year from now. Searching the internet I found mixed results on whether or not you can ferment sour and clean beer in the same chamber, let alone at the same time. Since no definitive answer could found I decided this should be my next process experiment. Around the time of deciding to brew this I was listening to a lot of Jamil’s old shows on the brewing network, and, became really interested in trying the Roeselare blend from wyeast. After deciding to try this blend, I settled on the recipe from the first sour, and chose to do a 10 gallon split batch between WY3763 and a normal Trappist ale. The Trappist ale would be fermented side-by-side with the sour and subsequently entered into the NHC to determine if BJCP judges noted this beer as having any off flavors consistent with cross contamination. Also, with the high FG, I decided to use the Trappist ale to top off my sour which would eventually be transferred to a Hungarian oak barrel for aging.

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