Okay, my search terms aren't getting me my answer. I have just got all my C-41 chemicals but I'm a bit confused so I'm going to write this out and hopefully have you all correct my processes before I screw up. I have the Trebla TL-50 FilmPAC and the separate starter. The volumes in the FilmPac are supposed to be proportional but the bottles don't indicate their actual volumes so my original thought that I would mix replenisher as I go seems unworkable now. It looks like I'm supposed to mix up the FilmPAC replenisher concentrate into a full ten liters of developer replenisher, what I will call "stock", all in one go. This stock would then be stored. Then to make the first batch of working developer I just add the right amounts of my replenisher stock, with my starter concentrate, and water to fill my working solution storage bottle, say 1.5 liters. For me 1.5 liters would be enough to fill any one of my small tanks and still have enough to spill a few drops. From this working solution bottle I could pour 300ml of the working developer into my single reel tank. (950ml for my 4 reel tank) While the working solution is in the developement tank doing it's thing to the film I could be adding the right amount of replenisher to my working solution storage, in this case 21ml. (84ml for 4 reels) When the timer tells me the film is done I'd then dump the used working solution back into the working solution bottle until full and dispose of the extra 21ml of used solution. (84ml for 4 reels) Here's my confusion/question though. Do I add more starter or was that a one shot forever thing?