Using a Jobo forced film washer
I just picked up one of these. Seems like a simple device but I can't find any instructions online.
If I had to guess I would say that you pop the lid of the tank but leave it on loosely, then insert the washer. So the water flows down the column and then back up and out the sides of the tank.
Can anyone confirm or correct?
Jobo washer from a Jobo manual
Here is their own photo of the washer. They do call it a "cascade", but I just don't associate that name with this device.
And my only wall decorating was done with a Kodak style emulsion mixer made for me by a friend. When we first tried it, lets just say it "overperformed" a tiny tad!