The business model "cheap printer, expensive ink" applies here, although the device is not cheap. My last filter worked for about 6 months when set to auto adjust. which means that at $50 a year I need at least $100 a year to run this air purifier. I think replacement filters are grossly overpriced and I'm pretty sure that's what Levoit does for a living. However, they work pretty well. The old ones look dirty. And I noticed that the amount of dust is much less than it used to be in my apartment. My first suggestion was to reduce the fumes from roasting meat as well as other general smells from the kitchen since I don't have a true oven vent. Machine and filter have improved significantly. I hate how much these filters cost. I work in a production environment and wouldn't be surprised if these filters sold for 10x their price, which is $5.
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