Changing Trub loss in Beersmith results in more water but doesn't lower OG?

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beervoid

Hophead & Pellet Rubber
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Hello,

Why is it that when I raise the trub loss amount in the beersmith water needed tab my sparge water amounts go up but my predicted OG stays the same?
 
Guessing that when calculating OG it only uses the value entered for brewhouse efficiency.

You could pretty easily calculate the adjustment yourself.
 
So the more hops you use, the more trub you generate, the lower the efficiency of the brew house I guess?
How would you go about calculating the adjustment?
 
B= batch size
T= change in trub loss
O= old efficiency
N= new efficiency

N = O * ( [B - T] / B )

That should work.
 
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