Comments about Blueair 500/600 Series Particle Replacement Filter Set (qty 3):
I bought a Blueair air purifier two years ago and I am very happy with it. It protected me from the smoke coming from my next door neighbors; I could not make it without this great thing. Now, I live in a new house and I use it with the regular filter to clean the dust buried in the carpeted floor. I would recommend this to a friend.