alt Hacker News >Of course, the problem with this is you are just spending more money on filters, which is the expensive part.
For cost over time, twice the filters means twice the replacement interval, so the additional filter cost cancels out.
But since you bought mostly media, you didn't get a housing that hides the media, and you get to look at any collected dirt for that longer interval as well...
I'm sure it works but like any engineering decision it has pros and cons.