BLUEAIR Blue Pure 121 Genuine Replacement Filter, Extra Protection Particle and Activated Carbon, Fits Blue Pure 121 Air Purifier

The Blue Air unit has been reliable and the Blue Air filter replacement was as described. There are some off brands out there that have poor reviews, so do your homework.

Given my sneezing is persisting, I will likely not again spend the premium dollars for this ‘Extra Protection’ filter.

It's a little expensive, but does seem to last > one year. Old one was definitly clogged with fine dust and dirt. I highly recommed using these under you main return vent.

Love this air purifer and the filters fit great.

Why is this now so expensive. I bought it for $69 and now it is $247.

This replacement filter popped right into the air purifier and works as it should.

Easy to install and fits. Cannot really say how well it works.

this filter is better than any other knockoff filters. very durable.

This is a direct drop in replacement for the Blue Pure 121 filter. It looks exactly like the original and works the same.My only complaint is that these filters are really expensive and almost never goes on sale.

Reasonable price, fast shipping and excellent product!

This is a direct replacement for the existing filter, so everything worked as expected.

The filters are easy to install and work well. However they have almost doubled in price since I originally purchased the Blue air unit several years ago. I would have not bought it if I knew how expensive it was to operate!

I wish this filter was cheaper but otherwise it works great. Easy to change and it does the same great job as the original filter!