Thank you, I use a stir plate, I was meaning, the wort. Thought more oxygen would be needed for the yeast to hopefully finish the job.Yes, you would aerate the liquid yeast in a starter (1L or larger) to get it going prior to pitching into your stalled 5 gallon batch. If you are using a stir plate, this will provide adequate oxygen. If you are making a starter without a stir plate, agitate or use supplemental oxygen like an air pump or O2 bottle. Pitch in 24-36 hours. If using dry yeast, just pitch directly, dry yeast does not need a starter or aeration. Do not aerate the 5 gallon batch at this point, undesirable oxidation may result.
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