How long should a liquid fixer concentrate, like Ilford Rapid Fixer last in it's bottle? I am switching over to concentrate liquid chemicals because I always threw out a considerable portion of a gallon because the chemicals went bad--- especially the case with D-76. I shoot lots of film, but when you only use 8oz at a time, it takes a while to use a gallon. I've decided upon HC-110 and Rodinal as my film developers. I use a water stop. As for a print developer, the jury is still out but since Dektol doesn't last long in working strength (and since you use more than 8oz each time) I use it up faster. I don't have to dump much of it. Along those same lines, how long should a gallon of fix last, as a ballpark figure? I use a 5L black plastic jug from Freestyle to keep it in, pour out 16oz of it, fix my film, and pour it back in. Should I do it differently, such as pouring it into a separate bottle and using it from that bottle until exhausted, then get fresh out of the main jug? Will a bottle of concentrate fixer last as long as HC-110 or Rodinal? How long should a gallon of properly mixed fix last?