That is because that $5 filter does not filter very much at all! When you visit your Hardware store or wherever you are buying those filters ask about the more effect filters (yes, they cost more) and up-class your furnace filter. You will be shocked at just how much your current filter is just passing though. FYI: Never clean a filter indoors as you are just placing much of it back into the air.Thank you very much. At $40 a filter, and having to replace them monthly (3 of them as I have them on all floors in my house) as they are really dirty by then is so expensive. I was trying to find a way to at least make them last a few months. The odd thing is my air purifiers are full of dirt, and dander. My furnace filter usually looks good when I replace that monthly (only $5 to replace these filters).
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