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See also:
* [https://www.youtube.com/watch?v=boLqmFIzUZ0 Dan Pixley's video on "Airlocks 101 for Sour Beers".]
* [http://www.faybutler.com/pdf_files/HowHoseMaterialsAffectGas3.pdf The oxygen permeability of different plastics.]
==Modern Method - Fast Fermentation==