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You may get less wort out of the tun if you have deadspace and leave extra wort behind. You may get more wort to come out of the grain if you use a grain bag and let it drain. You may get a little less than 100% conversion efficiency. 300 is 83% of 360 so 83% is the best efficiency you can hope for. Therefore, you lose 48 x 1.25 = 60 gravity units. When you drain that tun or remove the grain bag, whichever, about 1.25 gallons will remain in the grain. That was setting brewhouse efficiency at 65. I did that on my current batch, it came in at 1.041, Beersmith estimated it at 1.045 I think. The profile is based on the Grainfather profile but the volumes were straight from the instruction guide, not Beersmith. That'll be a good starting indication of where you're loosing efficiency. Batch Vol 5.5 Gallons (hit these with ease). Posted in exBEERiments and tagged batch sparge, beer, BIAB, brew in a bag, brewing, craft beer, exBEERiment, experiment, experimental, home brew, home brewing, homebrew, homebrewing, no sparge on Augby Jake Huolihan. That means the sugar density (SG) is 1.048 or there's 48 units per gallon. If I were you I'd pull a pre-boil gravity reading next batch.
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Ok, so you have 360 gravity units in the mash spread across 7.5 gallons of liquid/wort.
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Assuming you lose 1/2qt/lb in absorption, your strike would have to be about 30 qts because 30 qts - 5qts absorption = 25 qts (6.25gallons) preboil volume. So, after conversion, you have 360 gravity units. Simple example:ฤก0lbs grain with a potential of 1.036 PPG. All that means is that you actually convert all starch to sugar in the mash. The way to think about this is to start with an assumption of 100% conversion efficiency.