After the Mash has set for 60 minutes and I complete the Vorlauf, should I drain all the wort from the Mash and then start Fly Sparging? Or, should I start draining the Wort and when the liquid gets down to about a half inch or so above the grain should I then start the Fly Sparge? I've always done it the 2nd way, but got me thinking, maybe I'm doing it wrong.
I don't know what others will say but I prefer to remove more wort rather than less in order to achieve a higher efficiency more quickly.
For fly sparging, you want to keep the wort/water level above the top of the grain bed, i.e. do not completely drain it before you start the sparge. If you do a full drain first, the fly sparge will end up channeling water through select parts of the grain bed, leaving a higher gravity wort behind (untouched in some areas) when you're done.
