Slightly underpitch or overpitch - lager

Homebrew Talk - Beer, Wine, Mead, & Cider Brewing Discussion Forum

Help Support Homebrew Talk - Beer, Wine, Mead, & Cider Brewing Discussion Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

PearlJam

Well-Known Member
Joined
Nov 11, 2015
Messages
84
Reaction score
12
Location
Johannesburg
I added the yeast (W-34/70) that I will be using to beersmith with the dates that is printed on the packets.

I have an older packet (7/2016) and two packets (10/2017).

If I use one new packet and the older one it gives me a cell count of 351bn and I need 372bn. If I use all three the count is 531bn. I am comfortable to use all three, but with the two so close to the needed count, which option should I go for?

Edit: I will be rehydrating fwiw
 
The number of yeast cells you pitch and the number that are needed for fermentation don't have to match. Yeast cells use oxygen in their replication so you can pitch fewer cells and aerate properly and get the number needed. Also the loss of viability over time with properly stored (refrigerated) yeast is overstated. If you kept the yeast packet refrigerated the older one may have near the viability of the newer one.
 
Back
Top