As far as I know, they both have the same applications - except the .2 will filter more pathogens then the .45. The .2 will clog faster, as a result of that, also. Not sure for the fina, specifically, but you’re looking at being able to filter about 20ml per .2 filter. That, at least, has been my experience with test-e and EQ. There are a few fina/syno recipe threads around here. Run a search and check them out. They should help.