Please see my post in the recent D-23 thread, or send a PM with particular questions.
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I do the same; free from local pharmacy. I calculated the amounts for 16 and 8 oz and wrote then on the bottle. When I need only 4 oz (I have a 4x5 tray, used only for this when I have just a few sheets or one), it's easy enough to do with the same pipette. The pipette also eliminates the inevitable drops of Photoflo finding their way down the outside of the bottle each time.