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Old 08-29-2012, 03:33 AM   #1
Aug 2010
Greenville, SC
Posts: 235
Liked 1 Times on 1 Posts

I probably have around 45 or 50 AG batches under my belt at this point, so I consider myself a pretty seasoned brewer. Tonight a brewed an IPA, and for the first time ever got a significantly low efficiency. I normally get in the range of 75% to 78%, but I got 60%. Every other number I had control over, I nailed. My mash temp was spot on, my sparge was the same as always (I fly sparge), my pre-boil volume was right on, and my post boil volume was only about a 1/2 quart high. The only thing that I can come up with is that my LHBS crushed my grain improperly. I plan to ask them if they made any changes to their mill the next time I'm there. Is there any other possible problem that I'm overlooking?

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Old 08-29-2012, 03:49 AM   #2
Nov 2011
Posts: 209
Liked 21 Times on 16 Posts

How long did your grain sit crushed before you brewed and was this a recipe you have done before? Id ask the guys if they changed grain supply or changed the grain crusher at all as well.. ive noticed a difference in brewing with grain just crushed and grain that sat for a day or two.

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Old 08-29-2012, 05:27 AM   #3
May 2011
Tucson, AZ
Posts: 50

Assuming you have brewed this recipe before on that system, a change in ingredients seems most likely. Malt supplier, freshness, grind, or mismeasurement of weights could all be reasons.

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Old 08-30-2012, 02:36 PM   #4
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May 2007
Jersey Shore, New Jersey
Posts: 9,593
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If possible, take a look at your spent grains...a poor crush is perhaps even more apparent post mash IME. Look for larger more whole pieces of grain.

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