Usefulness of SG reading on first, second, third runnings in batch sparge - Home Brew Forums
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Old 10-25-2012, 07:54 PM   #1
Feb 2012
Harrisonburg, VA
Posts: 26

I now have 3 batch sparged all grain brews under my belt. All were for 5 gallons of beer. Here is brief summary of my methods:

-All calculations in Beersmith2
-Add strike water from HLT via march pump to MLT (Large coleman xtreme cooler, maybe too large for 5 gallons)
-Stir in grain, and let sit for 5 minutes
-Take temp to see if I meet strike temp, if not add boiling water from stove
-Continue to monitor temp for 60, adding boiling water if dropping below 145F
-Voulauf by recirculating wort in MLT via march pump until clear
-Lauter 1st runnings into Boil Kettle via pump
-First batch sparge, stir, vorlauf, and lauter into BK via pump
-Second batch sparge, stir, vorlouf, and lauter into BK via pump

Over the course of these 3 brew sessions I've been trying to dial in on my equipment variables for use with Beersmith2. VOLUMES were my biggest problem, especially since it took me 3 batches to get my strike temperature and mash temp high enough and stable for 60 minutes (needed to add boiling water more than I wanted).

My third brew session was on point. My question now: what is the usefulness of taking an SG reading on the first, second, and third runnings? I understand that they should be decreasing in SG, but how can I use these numbers on the fly to benefit my brewing? I've been monitoring these numbers somewhat, but I don't quite understand how I can "use" them in the moment of brewing.

I'm also taking the pre-boil gravity after ALL runnings are in the BK. At least with this number I have an estimated number from Beersmith to compare, and I can add water or boil longer in the BK to compensate.


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Old 10-29-2012, 10:03 AM   #2
diS's Avatar
Apr 2011
Posts: 997
Liked 49 Times on 46 Posts

You can use them to calculate efficiency. Kaiser's batch sparging efficiency spreadsheet needs OG and volume of every run-off to calculate efficiency.

Efficiency-Troubleshooting-Spreadsheet (under Calculating Efficiency):
We are only 10,000 years into beer... there are thousands of years left to go!
Things are bound to change!!

Brewroom with HERMS build
Fermentation chamber and Keezer.. a.k.a. FermKeezer

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