I shoot very little black and white, but began developing myself recently to get some control. I have been using HP5 mostly but also some FP4 and Delta3200. I am using Arista F76 (from Freestyle), a reputed D76 equivalent.(posted 8550 days ago)My main question is about reuse vs one-shot. I typically process 3 or so rolls of 120 at a time. I have been mixing 600ml (2 rolls worth), processing one at a time. My negs look more or less the same between the first and last processed, so I assume I haven't exhausted the developer. How many rolls could one process in this manner, or should I really be using the developer once and dumping it. The spec sheets have some info concerning capacity, but it is not clear to me how to apply this in practice for such small amounts.