I do BIAB mash with no sparging. So all of my water is in the kettle as strike water. I pretty much have my volumes figured out but occasionally depending on how the weather affects the boil-off rate I miss my volume. I use a pulley to lift the grain bag, out of curiosity I usually weigh the grain bag after squeezing it like it owes me. I've been trying to get an educated guess as to my volume. Generally I'm shooting for 7.75 gallons pre-boil. My grain bag generally weighs only 4 or 5 lbs heavier post-mash than the dry grain did. That's about a half-gallon. Where does the rest of my strike water go? Most of my recipes use 8.75-9 gallons water. I am guessing as I extract the sugars out, the spent grain loses weight and actually holds closer to a whole gallon of water. Am I on the right track?
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