I paid over $2000 for this processor about 8 years ago and I have had more processing failure than simple manual tank inversion method with simple water tempering bath I did for many years before I got the Jobo processor. I was very excited to get the processor but it was like cold water pouring over my head when I first tried to process E-6 for a few rolls of Velvia 50 back then. I stopped processing E-6 due to much higher cost and before finding out what caused the process to fail but I continued with C-41. I found I was'nt able to process two 220 rolls in one processing run. The results were poor and I wasted a lot of films and chemicals. I ended up to process only one 220 roll at a time with 850 ml of developer (bleach and fix as well). The result was better but I never felt great about it. I pretty much concluded that Kodak C-41 developer's capacity is 1 roll of 220 per liter and this is documented in Kodak Z-131 tech pub. Jobo ATL-2300 tank capacity is 1 liter. So I pretty much determined that despite it is a huge machine it can not process more than 1 220 roll at a time. Mean while I kept on hearing people saying they are able to process a roll of 220 with as little as 300 ml +/-. Then I saw a suggestion from PE to pre soak (with 100 degree water) before the development step. If I remember correctly he even suggested pre soak twice. Man, this was like light at the end of a tunnel. What did he mean by that? He was referring to processing with Jobo processors. I think PE made this suggestion many times before many years ago. It was only when he said to do it twice that hit my head and woke me up... I ran a processing drill with my ATL-2300 with no films set up with two pre soak steps before the development step. This is C-41 that I am talking about. I waited patiently by the processor. When the processor drained and collected the first pre soak water I measured the temperture of it immediately. It was 96-97 degree. The 2nd pre soak water came out to be 98-99 degree. I was stunned. What if there were films in the tank, especially with 2 rolls of 220? The process would have failed no doubt. I immediately started a series of testing with real 220 films. I started out with 850 ml still and programmed two steps of pre soak with 100 degree water before the development step. Sure enough I shouted out bingo when I looked at the result. All were perfect. I continued with several processing runs, each with 2 rolls of 220 and the last two processes with only 630 ml of developer. The result were still perfect. I have not done it again with the next trial with 560 ml yet. I am pretty happy with 630 ml now. What a difference these two pre soak steps made!!! I finally realized that Jobo rotary processing has this problem that the films really need to be pre soaked with tempered water or when the developed is poured into the cold tank the process will fail. I was able to do one roll of 220 with 850 ml before because the volume of the developer was quite large so the temperature did not drop too much. Now with two steps of pre soak I can do two rolls of 220 with as little as 630 ml of developer. I feel that I need to say a few words here to thank PE for his great contribution to this forum. Thank you so much PE. With your tips I finally solved the problem. Jobo ATL processors have 6 tanks only. So this may be a problem for E-6 processing. You can't use any of the tank for pr soaking the film. But I realized that you can still program it to rinse the film before the process starts. The rinse water will have to be tempered at exactly 100 or slightly higher than 100 degree. I will have to set up a tempering bath to provide tempered rinse water for my ATL-2300. This will take some time so I won't be able to try E-6 soon but I definitely will want to do it in the near future. My next goal is to process 4 rolls of 220 with 1 liter of developer. I hope the developer has the capacity of 4 220 rolls per liter. If not I am sure it will do 3 rolls at a time.