I think you'll find processing one sheet at a time can be a bit slow.
It won't take long before you are doing a search for "3006."
Regarding film washing in drums: Fill the drum with water and leave it for a minute or two, then dump. Now Put in a bit more water than you would use for chemicals, runi it for 2 minutes, repeat this for a total of 6 drum washes, this is archival.
If you are using drum processing of fiber based papers, use 13 changes of water.
The above are archival and use surprisingly little water. If yo just ran water continuously into a drum or tank, the efficiency would suck, it would not be archival.
I wondered about washing in the drum. It seemed to me like the film doesn't get a lot of chemical on the back side of the film because it's touching the drum. I guess you are not finding that to be true? Most of my schmutz is on the back of the film.
After getting frusterated with the idea of using a soft ply rubber eraser as the unicolor sheet film spacer and find after a process run, destroyed film due to it splitting from its softness. I contacted this company out if Illinois gace them a blue print of what I needed being this spacer since they are no longer obtainable, or so I have found. This is all the information given on a quote if anyone else is interested in obtaining what I tried to make as close a replica of the original using an engineering program. Here is the reply with all info of quote.
Below is quotation for the products you requested.
FYI, we use metric system and closest thickness of .09"(2.286mm) ring is 2.5mm (.0984")
If you have any question, please let me know. Thank you.
Material: Neoprene Rubber
Hardness: 65 +/-5 Duro
Dimensions: Based on your drawing. (MM)
Unit Price: @$17.78 (Total $177.80) Included S&H
Dimensions : Based on your drawing (Inch) with 2.5mm Thickness
Unit Price: @$10.30 (Total $103.00) Included S&H
Lead Time: 12 Business Days