I have discovered an Imperial stout recipe that is all-grain, but it is a 10 gallon recipe. I am set up for 5 gallon brewing. I have used a calculator that has been linked on this ng and it seemed to just half the recipe. Is it as simple as just dividing the grains in half to adjust the batch size or is it more complicated than that?
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I know a guy who work in a micro brewery (not as brewer) and is also a good homebrewer (he win our local competition each year). One year he took the receipe of one beer from the microbrewery and divided quantities to make it at home, he used the same ingredients. The results where good but not exactly like the comercial one. He explained that some chemical reaction must not happen the same way in small volume.
In your case, going from 10 gal. to 5 gal. should not make too much difference. On the other way i heard that going from 5 gal. to 2½ or less will have an effect because at those small volume hops levels will change.
Just cut the recipe in half. I usually brew 2.5 gallon batches using recipes for 5 or more gallons. I just adjust all of the quantities accordingly. Likewise, if I develop a 2.5 gallon recipe that I like, I might make 5 gallons the next time by doubling everything. It really is as simple as that.
-- Dave "Just a drink, a little drink, and I'll be feeling GOOooOOooOOooD!" -- Genesis, 1973-ish
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