Originally Posted by krazydave
Just thinking last night... How long does one generally let the grain bed settle when doing a batch sparge? Once I put in the 175 degree sparge water, I only let it sit a couple of minutes and then vorlaufed for about 5 minutes. Is that maybe not long enough?
For batch sparging, you don't have to wait at all. Just stir well, vorlauf, and drain.
I have lower efficiency with larger grain bills, myself. But not with only 12 pounds of grain. Generally my lower efficiency with larger grain bills comes from undersparging. What I mean by that is, say I have a 10 pound grainbill. I mash with 15 quarts of water, and then get out 3 gallons. I then sparge with 4 gallons, to reach my boil volume. But when I use 20 pounds of grain, I use 30 quarts of water, and get out 5.5 gallons (for example). I only need 1.5 gallons of sparge water to reach my boil volume. So, when I do a "bigger" grain bill, I often get 68% efficiency.
In your case, that's not a big grain bill at all. How was your crush this time? Edt- I see you say it was "the same". How did it look?