Quote Originally Posted by Greg Davis View Post
I am looking at getting one of these for the university darkroom I teach at. How can I tell when it is full and needs to be replaced? We go through a lot of fixer and silver since we collect all fixer used in film, printing and color processes.
You are sitting on a gold mine! (silver mine) haha. I actually have a few large containers of fixer in my teaching darkroom as well.