I have two yeast starters going on my two homemade stir plates. The stir bar or the stir plate for one of them is malfunctioning and I can not increase the speed enough to get a vortex going. It is ...
Many online references, such as BYO, mention that oxygen is needed by yeast to reproduce, and that a wort with low dissolved oxygen levels will have longer lag times and less attenuation. This might ...
To my knowledge, aeration provides oxygen so that the yeast can reproduce before fermentation. If you're pitching onto an existing yeast cake, there should theoretically be enough yeast already to ...