Author Topic: Addition of Lactos changes Expected Original Gravity and Grain Weight  (Read 3902 times)

Offline vdeckard

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When adding Lactos to my recipe, my Expected OG will change.  However, I understand that Lactos is non fermentable, therefore it shouldn't change.  Also, the lactose is included in the grain bill, thereby changing the pounds of grains which affects the mash thickness and strike water needed.  This means that when I am constructing a recipe, I have to leave the Lactos out in order to get proper readings. 
I've noticed that several people have written in about this, but I don't see that this topic has been addressed.  How can we go about fixing it?
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And thanks for an otherwise great software.
Vera

Offline Beezer94

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Re: Addition of Lactos changes Expected Original Gravity and Grain Weight
« Reply #1 on: April 12, 2013, 10:47:50 AM »
Even though lactose does not ferment from brewing yeast, it is still a sugar; Therefore it will absolutely raise both the OG and the FG.  If you check the box "add after the boil" then it will still show up in grain total, but will not affect the mash water quantities.

Offline vdeckard

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Re: Addition of Lactos changes Expected Original Gravity and Grain Weight
« Reply #2 on: April 12, 2013, 11:02:19 AM »
Even though lactose does not ferment from brewing yeast, it is still a sugar; Therefore it will absolutely raise both the OG and the FG.  If you check the box "add after the boil" then it will still show up in grain total, but will not affect the mash water quantities.
Okay, I understand that.  But maybe I am being dense...Does it not then interfere with my expected final gravity?

Offline tom_hampton

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If you check the box "add after the boil" then it will still show up in grain total, but will not affect the mash water quantities.

Even though you check the box "add after the boil" or add it during the boil (say 15 minutes from knockout), beersmith still includes the lactose in the PRE-BOIL gravity estimates.  Brad acknowledged that this is a bug when I reported it (about 6 months ago).
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