Review on 2-Pack FLT4825 True HEPA Filter B Replacement with Activated Carbon Pre-Filters for Guardian Air Purifier Models AC4825, AC4300, AC4800, AC4900, AC4850 by Marley Woods

Overall: I've gone from dusting daily to cleaning once or twice a week here on the farm. Pros: Visible dust floating in the sun? Almost gone, I can see the difference in my house. With two dogs on 1000 sqm. ft. This does a great job of picking up and stopping dandruff. I turned it off a few weeks ago and forgot to turn it back on. Day 2 remembered and turned on. Later that day I felt the air was so fresh and clean and then I noticed the filter was working again. A 2-pack is handy so there's always a spare when the lights come on. I've been using for several years