BLUEAIRBlue Pure 211+ Dark Gray Pre-Filter, Washable Fabric Traps Pollen, Pet Hair & Dust, Dark Shadow

I have the Blueair purifier and this is the best outside filter to use.

I like this cover better than the one that came with my blue air 211. Much easier to install and remove. Seems to collect dust and pet fur better.

Unfortunately this fabric pre-filter does not fit my Aerus AQ 1000 air purifier. But it does fit my Aerus Guardian Angel air purifier, just not as snugly as the original Aerus fabric pre-filter, but it is far less costly than the Aerus one!

I use these over three different air filters in my house. They are different sizes, but this product fits all of them perfectly! I don’t have to clean the filters nearly as often when I use these.

Pros: Definitely reduces dust quickly. And is pretty quiet especially on lowest speed. The exterior cover/filter is very easily washed, dries very quickly. Cons: Interior filters are pricey but good quality. Somewhat awkward to move so some indentation or handle on back would help. Very satisfied.

Excellent product, in that it does what it’s supposed to do! I have four cats and can see what a terrific job it does prefiltering cat hair and dust! Because it works so well, and presumably extends the life of the main filter, I do change the prefilter out more frequently than recommended. Perhaps my washer is rough on them, or perhaps I am because I struggle to get the prefilter on (awkward job despite how light the unit is), but one of the four prefilters I use in rotation has already torn. Improved durability would make the product a better value for the money.

This is the best quality for my air purifier. There’s another company selling them, but the quality is so much lower. I went back and bought 1 more

We bought this one year after there was a fire in town and we didn't want the smoke to be in the house. Every year I'd have to get allergy shots due to extreme allergies to pollen. After we got this thing (2 years ago) I haven't had to get an allergy shot AT ALL! It actually helped!!! We have it on practically 24hrs a day and the filter lasts a long time, the light is easy to read so we know when to change it. The filter replacements aren't cheap, but it's okay given they last a while. The fiber cover is easy to change as well. Great product. They are pretty big though so it's hard to find a place for it that it's not such an eyesore.