Danstar and Lallemand premium brewing yeast is manufactured from pure brewing yeast strains using...
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O2
Air Versus Oxygen
At present I oxygenate my wort inline during cooling with pure (?) O2 as I assume it to be as close to sterile as possible in a homebrew situation and hence more practical than working with an aeration stone and aquarium pump after cooling to pitching temp. Although I have not experienced any problems with fermentation, I wondered what your views on it would be regarding yeast health etc.