re: Homebrewing: Brewing in process thread (with pics)

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But if my evaporation rate is much less, then my mash efficiency hasn't changed.

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I agree with the statement above.

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I don't think my post-boil volume has anything to do with mash efficiency. I guess i won't be sure until my next brew, of how volume effects mash efficiency.

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Your total volume and OG have a direct connection to your mash efficiency though. You are shooting for 5 gallons at X.XXX OG. If you do not get that then your mash efficiency was off of what you expected it to be.

I don't think there is anything we are really arguing about. I think I use on calculation for the same information that you are trying to use 2. In the end I am trying to ensure that I get 5 gallons at the OG I planned on, and that is all that I am concerned about.