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In part 2 of my video series on collecting wild yeast I go over a simple method of generating pure strains of yeast and bacteria from a mixed culture. While this video concentrates on purifying organisms from wild ferments, it could also be used to purify yeast from a contaminated beer. Additional information can be found on my blog: http://suigenerisbrewing.blogspot.ca/2014/12/two-new-videos.html