Need some help. the kits I purchased did not come with instructions.
I Have already downloaded 5 different conversion instructions for Fina/Tren.
I probably got the last of some kits from a certain company that is currently no longer around.
With my kits came two “Whatman Filters”, one is “.45”, and the other is “.2”
All my instructions I have found so far online mentions .45 filter.
What is the .2 filter for, and when is it used?