Burr Changes Based on Volume
If you are brewing with blunt rebarbas, the extraction target will drop even lower. Scott Rao calls this the ‘extraction ceiling’. Over time, 21% extraction will start to taste over extracted, so you will need start targeting 20% extraction. If you find yourself aiming for below a 19.5% extraction target, we would suggest it is time to change your rebarbas. This is never cheap.