The air purifier I bought 5 months ago came with this filter. It says to replace it every 12 months, but as you can see the filter on the left is black and the "replace filter" light on my air purifiers is already on. Of course I've moved since I bought it and I moved to a place where the smoker used to live. But I found that my allergies don't bother me that much when I started using it.
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