hawkeyes

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I plan to start doing 2.5 gallon batches. I'm curious how much yeast I should use. If I use dry yeast, should I use a full packet or half? For Liquid, full packet?

thisoneguy

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OG is the missing piece of information here... check out mrmalty.com

hansaurelius

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I do 2.5 gallon stovetop all grain batches most of the time. Try using Jamil's pitching rate calculator. It will let you calculate starter size or grams of dry yeast
http://www.mrmalty.com/calc/calc.html

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NordeastBrewer77

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this guy will tell you all you need to know.

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hawkeyes

Recipes 

Thanks! This brings me to my next question. So if its .08 or .09 packet of liquid yeast, I would be safe with 1 full packet? As for dry yeast, if it ask for half a packet, is it safe to store half the dry yeast in the fridge?

bighorn_brew

Recipes 

For most common ales with original gravities of about 1.05 one half of a 11.5 gram sachet should work for you, but honestly unless you have a way to seal the sachet back up with a minimum of air I would just pitch the whole thing.
Something along the lines of this might work out for you.
http://www.amazon.com/iTouchless-BR001U-Bag-Re-Sealer-2-Packs/dp/B000N5YBKC/ref=sr_1_1?ie=UTF8&qid=1328494676&sr=8-1

pabloj13

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No that would be way overpitching. Now it it were 0.8 or 0.9 that might be a different story...

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fxdude

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I think pitching a whole liquid yeast pack for a 2.5 gallon of 1.050 would be fine. Mr. Malty is saying you would need around 88billion yeast cells and one liquid yeast pack is around 100billion when brand new, by the time most of us get them they're a week old and have lost little bit of viability.

A lot of the recipes in Brewing Classic Styles around that gravity call for two liquid yeast packs (or an appropriate starter) for a 5 gallon batch. The dry yeast is a different story, I haven't worked with (or read up on) that as much.

A4J

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I've never had luck with those things. Does that work for you?

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bighorn_brew

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I work indirectly with an industrial deskstop version (surgical instruments are sterilized and double wrapped and sealed with something similiar,) but would think there would be a consumer version that works well, but perhaps not.