I use 1 lb grain = 10 fluid ounces as its volume contribution, when submerged in a mash.
So, 15 lbs of grain, at a thick mash of 1.3 lb/qt gives 4.88 gallons of water needed and the grains take up 1.17 gallons. Total is 6 gallons. And you really need to sparge to get that sugar from that thick mash off that grain.
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