Hi Mike
Sorry i'm late to the party on this one, was searching for more info on debourbage and came across the thread.
I have done 2 debourbage batches so far this year and have a 3rd started last night.
Generally, I fill a 'fast ferment' plastic conical up with 8 gallons of fresh juice mixed with 6-8 teaspoons of pectic enzyme and let it sit for 24 hours at basement temp, which is about 67-68F. There is a ball valve at the bottom of the conical, allowing me to purge the sediment quite efficiently, especially if I do if in a few stages.
So far, I only have needed to purge 1/3 to 1/2 a gallon of 'sludge' per 8 gallon batch before reaching the cleared juice. I'd say 6-7% loss at most.