The original article's unit flow rate must have been underpowered then. Or the filter had insufficient holding capacity before passing the dust mite allergen particles back into the air. It never seemed to catch enough of what it passed through. Regardless, it was completely insufficient for the palpable relief I was accustomed to.

I use the Wirecutter's Coway unit recommendation mostly. I have not tried the larger IKEA unit but at least it seemed to mitigate the above.

Good notes, thanks for sharing, I do already take those precautions, mop weekly, no rugs, prefer ample fresh air (ERV or window), and now mostly rely on HEPA filters for extra relief during exercise (kicked up dust), when I'm struggling, or in pollen season. The new nasal azelastine antihistamine also helpful.

Even true HEPA filters can also get inundated a bit too quickly (1-5 mo) in my house otherwise and if I don't notice that, it's worse than nothing. So excepting pollen season, fresh air has a better failure mode.

To affect relative humidity to <50% for mites, unfortunately as far as I can tell, high humidity requires kilowatts of electricity to drop in older buildings in rainy climates, esp. without sealing and compromising air quality in other ways (CO2 too).