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1

I agree with all of the above. Assuming that you are making a 5gal batch, one packet of US-05 is seriously under-pitching and probably won't make a good beer. However, the question asked whether it's advisable to add more yeast now that the fermentation is underway. The two consequences of under-pitching that you're likely to encounter are ... 1) Increased ...


2

Yeast pitching rates aren't always too easy to figure out. No one seems to agree on how many cells you should expect in a gram of yeast (various sources state anything from 6-20 billion per gram), and different yeasts have different size cells and clumping tendencies, so the correct number of cells can vary between different strains of yeast. For a rough ...


4

That yeast is 6x10^9 cells per gram at packaging. 69 billion cells in the whole pack. Your beer needs about 279 billion cells (5 gallon batch) While 1 pack is an under pitch you should be ok. Some styles do better with a slight under pitch if you want those growth esters. It's always a good idea to do a starter it will at least proof the yeast for you ...



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