As someone with terrible allergies, I've been running my AC4825 air purifier 24/7 for years. When I first tried these FLT4825 replacement filters, I was skeptical - could off-brand filters really perform as well as the OEM ones? Three months in, I'm completely converted.

The installation was laughably easy - literally a 10-second swap. What impressed me most was how these filters maintained that crisp 'new filter' airflow feeling for weeks longer than my previous replacements. My apartment smells noticeably fresher too, especially after cooking fish (my roommate's questionable culinary choice).

I did a side-by-side test with an old OEM filter using my air quality monitor. The particle count reduction was identical, but these actually trapped odors better thanks to the generous carbon pre-filters. At 2AM when my neighbor's cigarette smoke used to seep in, my purifier now handles it without waking me up coughing.

The included UV reset trick (holding the button for 5 seconds) worked perfectly - no more annoying blinking lights. And having 4 HEPAs + bonus carbons means I'm set for nearly two years of clean air. For the price of one original filter, this pack is hands-down the smartest allergy investment I've made this year.