Any thoughts on storing yeast? I buy in 500gm bricks and then re-package into 10gm vacuum packs. In my (simple!) mind a dried product should retain all of its condition treated like that but am I kidding myself? I'm using Safale products so have S04, US05 and now some Safcider as well. I keep getting phenol flavours in my beers and am now wondering if yeast could be the source.