Are they SS barrels? They can be cleaned , best done shortly after emptying. I stand them up on a raised platform with the open bung hole down and barely hanging off the platform. I then spray them with hot water using just a 3.3 gpm diaphragm pump and pushing permeate thru my instant water heater. The spray does well, and being permeate it takes on anything in there. I put the nozzle in the bung hole , prop it there and spray for 10-12 minutes. If I run out of permeate, I haul in some water from home, let it set for 1-2 days to evaporate off some chlorine, then I use that water. Any water left is pumped into the permeate tank except when freezing weather is possible.
If this is being cleaned a long time after the barrel was emptied, I think a barrel washer may be needed. The one's I've seen rotate the barrel at about a 45 degree angle with the open bung down and a spray of good potable water is sprayed in.
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.
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