I have come across this info that rehydrated yeast slightly foam.....now my question is "why doesnt mine foam at all?"
I use safale US-05 and follow the instructions of Chris White (author of the book "Yeast"). I normally use bottled water that I boil before use.
Any thoughts? Or people who got good results and the yeast didnt foam at all?
P.S. So far sanitization was not 100% okay.....I dont know if that might have been the problem.
I have never seen any noticeable foam on re-hydrated dry yeast. If you aerated it, which is not recommended, it would likely have foam.
I usually get some foaming with US-05 when I rehydrate. It's not like a krausen but there is some foam that I then stir into a creamy slurry and pitch.
I get at least a little foam on the surface when rehydrating most yeast strains, but some foam much more than others.
Aerating the hydrate should be fine. I don't...well,not that much,but I do get a little foam on top.
+1, aeration won't hurt anything while the yeast rehydrates. Nothing to worry about.