planning to brew the Saq kit (its a Westy 12 clone) tomorrow and not sure how much yeast I should pitch. 5 gallon batch, OG 1.090. I have 3 packs of wlp530, all three manufactured back in Jan 2019. Mr Malty says the viability is around 10%, so I would need 11 packs with a starter on a stir plate. Obviously, Im not doing that, but curious what everyone thinks or if anyone has had experience pitching older WLP yeast?
I began the starter with one pack, then this morning, concerned I would be underpitching due to the age of the packs, I added a second. Should I add a third?