Quantcast

Changing my FG?

HomeBrewTalk.com - Beer, Wine, Mead, & Cider Brewing Discussion Community.

Help Support Homebrew Talk:

whovous

Waterloo Sunset
HBT Supporter
Joined
Dec 20, 2013
Messages
1,453
Reaction score
267
Location
Washington
OK, I know the numbers I get from BeerSmith or anywhere else are just estimates, but bear with me...

My latest brew is close to finishing. I was at 1.013 yesterday with 14 quarts in my Catalyst fermenter. BeerSmith projects a finish of 1.011. I removed a quart of trub via the Mason jar and replaced it with a quart of RO water to avoid adding O2 when I replaced the jar and reopened the valve. If my math is right, this reduced my SG from 1.013 to 1.012. Did I also change my FG from 1.011 to 1.010? I think so. Am I missing something?
 

day_trippr

"Now brewing exclusively with Hydrohydroxic Acid"
Joined
May 31, 2011
Messages
35,118
Reaction score
17,010
Location
Stow, MA
Dilution with a quart of water would indeed drop the current specific gravity by one point. If the beer continues to ferment to the original prediction the dilution would still apply, so 1.010 would be the final gravity...

Cheers!
 

kh54s10

Supporting Member
HBT Supporter
Joined
Aug 6, 2011
Messages
18,715
Reaction score
5,449
Location
Edgewater
I would guess that the dilution of the current gravity would also drop the FG. But whether it is one point or 4 or 5 points is all up to the yeast and how much sugar there is that they are able to convert.
 
Top