Thank you for this. I've been looking into buying air filters and would have made this mistake. (HEPA sounds good!)
I'm confused by your dust and pollen comment. What about PM2.5, is this mostly dust or are you not that concerned about this vs dust?
MERV13 will do PM2.5 very well. It can do smaller, like smoke and PM1, but not as well.
MERV13 will do PM2.5 very well. It can do smaller, like smoke and PM1, but not as well.