This gallon jug holds the gallon of TF5 fixer I've used for developing film for a couple months now. I keep re-using it and it keeps going with almost no slowing down. I test it from time to time with a scrap of pre-washed tmax400 film and a shot glass of fixer. Despite the silver stained jug, it's still completely clearing the film in <1 minute at about 65f. Tmax is a slow film to fix and clear, so that's a good time. I think I'm at the recommended capacity of the fixer and the capacity seems quite conservative.
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