I recently read an article about how to calculate how many pounds of sanitizer (sodium hypoclorate, and calcium and lithium hypoclorate) is needed to reach breakpoint. I set up an Excel spreadsheet so I could just plug in the numbers. The problem is, I don't know how to translate "pounds" of sodium hypoclorate into gallons of bleach. I also don't think the article mentioned anything about the concentrations of sanitizers.
I don't think I've heard much discussion around here about breakpoint. It seems that the method is to measure TC, FC and CC, and to raise the ppm of FC according to the best guess chart. I like the idea of breakpoint, however, because it tells me what I need to shoot for.