I bought this after reading that it has a permanent filter that could be vacuumed and that I would not need to be spending for replacement filters. Under the "Electronic Filter Check Reminder" section in the instruction manual, it reads "You should periodically check the filter. Depending on operating conditions, the filters should be replaced every 6 months."The next section is titles "Replacing the Hepa-Type Filters." it gives a link to buy the filters every 6 months at [...]. It also gives a phone number to order replacement filters.The description at Amazon.com seems to be untrue. The instructions state that this air purifier does need regular filter replacing.