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the underpitch

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n00bBrew3r

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in what situation is it possible to "under-pitch" yeast? i use 1 packet per 5 gallons but what if i add extra dme, lme, or dextrose??
 
Run your batch numbers through this calculator - http://www.brewersfriend.com/yeast-pitch-rate-and-starter-calculator/

Generally, if you rehydrate a packet of dry yeast that's been properly stored, it will provide the needed cells for a 1.060 or lower OG 5-gallon ale. For a lager, double the amount of yeast.

If you're going to try liquid yeast, get used to making starters. The packs/vials may say "direct pitch", but they come out of the factory with just 100 billion cells and the count goes down quite a bit each month to where the shelf life (in the fridge) is only 4 months.
 
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