Hi rulnacco. Is yours the same 5lt kit as the OP's or does Process Supplies supply it in smaller quantities such as 1lt. I can't speak for Tom but my C41 usage is likely to run into developer shelf life problems if it is 5lts. According to Tom a 5lt kit is 60 rolls which is a lot for me. I don't know what the claimed life of the dev but unless it is in years, I'd waste a lot of developer.
This might be OK if you could replace developer only. Can you? Or do you have to replace the whole kit?