Just installed these FLT4825 replacement filters in my AC4825 air purifier, and wow – the difference is noticeable immediately. The air feels crisper, and that musty smell from my dog's bed is gone. These aren't OEM filters, but they fit like they were made for my unit.

The package includes 4 HEPA filters and 10 carbon pre-filters – way more than I expected! The HEPA material feels dense and well-constructed when I run my fingers across it. Installation took literally 10 seconds: pull out the old one, slide in the new, and reset the indicator light.

What surprised me most was how well they handle cooking odors. Made bacon this morning and didn't smell it hours later like usual. The filters seem to be lasting well too – I'm at month 5 with the first set and still getting strong airflow.

For the price, getting this many quality filters feels like a steal. My allergies have improved since using them, and I don't wake up stuffy anymore. Definitely recommend for anyone with compatible purifier models.