I am just about to get cracking with Pyrocat HD in a Jobo ATL1000. Whilst I have been able to find out lots about the developer, I am somewhat at a loss with the fixer. I presume that an alkali fixer is preferred to retain the stain. I have searched the archives, but not found anything which addresses the issues I think I face. The Jobo programmes have fixer times which are all 6 minutes (at 20 deg C). I have been using Barry Thornton's Archevix which when diluted at the recommended 1:4 clears in 90s, so I have used 3 mins. The Archevix fixer has lots of capacity, so I have been reusing a number of times from my Combi-Plan tank. This is not that feasible with the Jobo (contamination from effluent pipe and having bought an auto-processor, I want to leave it alone and not stand over it) and so I envisage using as a one shot at a more economical dilution that fits the 6 minutes. When I switch to the Jobo, I do not want to over fix, nor use excess chemicals. I have run out of Archevix, so need to start afresh, but acknowledge that this is a common path of progrssion. Ideally I would like to mix my own fixer from raw chemicals, have found the TF-3 formula which apart from the smell, seems well regarded, but am open to advice and suggestions about with what and how to proceed. If it has any bearing, Acros in 5x4 is the film I use most frequently, but also use HP5 on occasion.