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Old 09-10-2011, 03:47 PM   #1
Sep 2010
Lafayette, Colorado
Posts: 148
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Wondering if I can get my efficiency higher if I switch to a single. I know there's lots of variables but am wondering what everyone thinks. Thanks!

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Old 09-10-2011, 04:05 PM   #2
Dec 2010
central coast, california
Posts: 311
Liked 10 Times on 6 Posts

I'm going to try some experiments with my house brew I keep on hand all the far I have been doing double batch sparging and achieving around 70 percent efficiency.

I just brewed a batch with a 14 lb grain bill and found that the sparge batches didn't even cover the grain bed and it was like stirring cement.My efficiency dropped to 65% and came in under my expected gravities.(I sparge to a preboil volume for a 60 minute boil as my kettle is only 7 gallons and lose 1.5 gllons per hour)
I'm thinking a single batch sparge would have been better with the larger grain bill but can't prove it

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Old 09-10-2011, 09:49 PM   #3
Jul 2010
south of hardwick
Posts: 425
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Theoretically, no. You should get slightly lower efficiency with a single sparge, all other things being equal. has extensive literature on the subject.

With larger grain bills the efficiency goes down anyway as Ms Bastard shows. She may want to mash in a bit thicker, or just use more grain.

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Old 09-10-2011, 09:59 PM   #4
SkyHighBrew88's Avatar
Jan 2010
Indianapolis, Indiana
Posts: 250
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I go for anywhere between 1.25 and 1.5 quarts/pound and anywhere in between. I try to end up with 5 gallons of sparge water to get two sparges at 2.5 gallons each (give or take a little).

Double batch sparges have given me an average of 85% with a high (twice) of 91%. This is with a stainless braid on a round 10 gallon cooler.
PRIMARY --Star-San
CURRENTLY IN BOTTLES -- Black & Blue Amber Ale
FUTURE BREWS -- DFH 90 Minute, Flying Dog Raging Bitch CYBI clone, Rye Saison

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Old 09-10-2011, 10:02 PM   #5
Sep 2008
Visalia, CA
Posts: 4,110
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I would naturally assume a double sparge would be more efficient, no? An opportunity to stir in the middle of things seems like it would mix up and channeling or "sweet spots" in the mash and get more out of the grain.
"Good people drink good beer." -HST

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