I once was involved with a technology that looked like it might be a good filtration material. I went to Michigan to a test company to get test data on various version of the stuff. We were chatting at lunch about using it as a car engine filter. The guy told me "Don't bother, GM and Ford set specs, and whoever meets the specs at the lowest price gets the job. Being better is not something of interest.".
The stuff had good test numbers. Incidentally, filtration is a rather complex science. We normally think of it as being a size kind of thing - interception they call it - and in general it's not that simple at all.
And of course effective filters tend to clog sooner than poorer ones.
I am reminded of all the hoopla about wearing masks right now.