Originally Posted by Bill Burk
My thoughts were not to use a #2 filter 'specifically' or to rely on the grades being ANSI.
I just think it would be a good idea to use a filter (or filtration) instead of unfiltered so that you don't have to figure out the next step.
Another thought. It might be good to make first round tests on whole filter number jumps instead of half filters.
Thanks for the clarification.