As far as I can remember the silver is converted to a complex with two thiosulfat-ions, which is well soluable, unlike the mono-thiosulfat complex. So a higher concentration would speed up the process, because it is more likely to find two thiosulfat-ions in a given time.(posted 8605 days ago)I use e.g. Agfa Agefix, which is diluted 1:7 for films as a stock solution, so test a piece of film with Hypam 1:9 for 2-3 times the time of 1:4.Any thinner than 1:9? I would be careful.
With Jobo rotation and Tmax film 1:4 Hypam goes oneway, 120 ml diluted Fixer per roll, as 10 rolls Tmax per litre is the max. for Hypam.