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Old 01-24-2009, 01:45 AM   #1
stale's Avatar
Mar 2007
Posts: 137

Anyone know how much of an adjustment adding 3/4 gal. of water to top off of fermenter? Like an idiot I took a sample prior to adding the water then found out I was short of my volume, so added the 3/4 gallon of water to bring it back up to the 5 gal mark, added my yeast and buttoned it all up. Don't want to go back in now 3 hours later and try to steal another sample.

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Old 01-24-2009, 02:03 AM   #2
homebrewer_99's Avatar
Feb 2005
Atkinson (near the Quad Cities), IL
Posts: 17,796
Liked 136 Times on 102 Posts

I've done the same thing...(on purpose) and came up with .002 for 1/2 gal.
HB Bill

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Old 01-24-2009, 03:00 AM   #3
Senior Member
ajf's Avatar
Oct 2005
Long Island
Posts: 4,646
Liked 105 Times on 99 Posts

Multiply you7 gravity by the original volume, and divide by the final volume.
If you added 3/4 gallon to 4 1/4 gallon to reach 5 gallon, multiply by 4.25, and divide by 5.


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