is this essentially the same product as photo flow 200?
C-41 is the process for development of color film. Photo flow 200 is a final rinse aid that will inhibit the accumulation of water spots on your negative. Replenisher can be added to developing chemicals to give them a boost from age or overuse that weakens the chemical reaction. Unless your using the C-41 process, which combines developer, stop bath, bleach,and fixer (blix) I would recommend using Photo flow 200.