Brewing an American IPA today, 17 pounds of grain 5 gallon batch. I think that this may be a good opportunity to make a second brew (parti-gyle). How would be the best way to determine the amount of hops to add for the second? This was totally unplanned, I believe I will have sufficient pre boil gravity on the second runnings as I do not require a large amount of sparge water on the first batch.
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