I have another thread going about making a homemade slot processor for color (I already have a Trimate for b/w, and I want to be able to switch back and forth without dumping chems. So I need two processors). I thought I'd ask here what people are doing for room temp RA-4 without running water. Thinking also of tubes, but I do not want to dump and refill a tube. Too much time washing and drying the things between prints. I'm thinking I might just get three tubes, fill them up all the way, and use them as I would a slot processor. Has anyone tried this, and was it easy to load and unload the prints with chemistry in the tubes? What is the volume of a typical 11x14 or 16x20 tube? Can they be air-sealed between sessions to preserve the chemistry? Any other (cheap) workarounds people have come up with for this situation?