Originally Posted by lamarguy
That would quite a leak to go from 1.096 to 1.070.
I vote - (1) not properly cooling the sample to room temperature or (2) selecting a turbid sample. Selecting a sample with visible hot break can cause off readings.
the numbers I used were just random numbers I chose to illustrate better what I was saying-but yeah it does make sense what you're saying about hot break.
I do see floaties in the hot sample, i try to avoid them to no avail, they're pretty much homogeneously spread out throughout the boil kettle-but they don't make it to the fermenter.
I was leaning towards this too-thanks.
I'm still sort of baffled as far as hitting similar efficiency marks with my system-I get really consistent 80 percent efficiency with about half of my recipes, but not so much with others. I understand with a big grain bill I'm going to get lower efficiency unless I decrease the water to grain ratio in the mash, or sparge longer, and boil longer to increase the amount of extract yield, so it doesn't really bother me that with different brews my efficiency is slightly off.
It just bugs me that post-sparge I get one number, before boiling,and so I scale down the volume to see what the gravity is going to be using beersmith. Then the gravity is way more than what I think it would be after boiling(flawed logic perhaps using apparent efficiency pre boil to estimate it post boil?). Then, post-chill, I get numbers lower than what I think it should be.
The erratic gravities are frustrating with new recipes, in estimating what the OG we're going to hit is. Once we get a certain result however, it repeats with the subsequent brews of the same recipe.
Brewing = trial and error, but really fun trial and error.