I always knew Photo Flo wasn't just soap, and I use it because my water is hard, but this is another reason to use it. You wouldn't happen to know the exact mix amount of Photo Flo for 16 fluid Oz of water would you? I feel that "to the line on the inside of the cap" is a little less than repeatable. Actually the Photo Flo mixing is the part of my process that I can't do the same every time.

Thanks for the info.