Originally Posted by gnatp2
I'm getting about 85% efficiency while sparging. I use 1.25 qts/lb of water and typically do 60-90 min mashes at around 148-153. I fly sparge with about 4 gal or so of water until I reach my 7 gal of perboil water volume. On my last sparge, my final runnings were at 1.016
I know this isn't extremely high but I'd like to get down to 75% or so as I hear that there is the potential for tannin extraction and I typically try to make very clean and dry beers so this is an issue.
Should I just stop the sparge early and top off the kettle with pure water? Im wondering if that would help. When doea tannin extraction actually occur? Is is only in the final runnings? Or is there something I'm missing and maybe I'm not at 85% efficiency and miscalculating?
How are you actually calculating your efficiency? Mash efficiency and brewhouse efficiency are different things.
Tannin extraction is not so much a factor of Mash Efficiency as it is a water temperature / pH and mechanical dispersion concern. Hot sparge, high pH and localized sparge water additions all increase the likelyhood of tannin extraction.
But if you aren't getting tannin bitterness then I wouldn't worry about it at all.