I use my finisher. I pump the syrup into the finisher, then when I pump the last batch in to have enough to fill a barrel (my draw off tank holds about 25 gal) I light the burners on the finisher, bring it up to temperature, verify density, adjust as necessary, then I draw it into my mix tank, blend in the DE and then send it thru the filter press and then into the barrel. I can do 2 barrels worth at a time, but prefer 1 at a time, because then as I pump the warm to hot syrup from my draw off tank, the syrup in the finisher is being heated and then I don't need to reheat as much to get it to filtering temp. I like to filter at 205-210F, that way it gets to the barrel at or above 180F. I grade it using the overflow from my barrel filler attachment, when the barrel is full a second hose runs from the barrel into a SS pot I set on the barrel. I use that to grade the barrel. While I have never filled a barrel in stages, I know many do, and do it successfully.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.