Yeast that has been dehydrated. Commercially produced dry yeast has a longer shelf life than liquid yeast (1-2 years vs 4 months) although it is not available in as many strains. One 11gram sachet of ale yeast, or 2 sachets of lager yeast is sufficient for a 5-6 gallon batch.

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Should you rehydrate dry yeast?

I've read conflicting opinions on whether or not to re-hydrate dried yeast. I've had successful fermentation with dried yeast in the past but have not tried re-hydrating. Has anyone had better/worse ...
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Proof dry yeast, or just pitch it?

In the past, I've used Wyeast smack packs, where the instructions tell you to make sure that the pack is viable before opening so that you can get refunded for a dud. I'm a baker, and I use dry yeast ...
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When should I hydrate my dry yeast?

I'm brewing beer tonight (in roughly three hours) and I've decided to try rehydrating my dry yeast instead of throwing it directly into the cooled wort. If I boil a couple cups of water, how long does ...