So much dust has accumulated in 5 months that I was very surprised. And that saves the more expensive filter from all that. So it does its job well. Either way, this is a great air purifier. Make sure you are the right size and all people. This air purifier uses a different size than other brands. This is not a one size fits all which is about the same size. So no one smokes here and the pre-filter lasted 5 months. I also do not recommend sucking them. replace it
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