« on: July 12, 2015, 05:34:48 AM »
Sharper people than I have already replied so take this with a grain of salt.
In addition to crush (already mentioned) anecdotally pH and grist ratio seem to affect my efficiency. For me getting my pH under control helped. In addition a water to grist ratio around 1.75 qts/ lb seems to be a sweet spot.
In the past if I get efficiency numbers that are out of whack, I first check my measurements.
This is all in a 48 qt cooler using a toilet braid and batch sparging