Filter replacements: Bissell suggests replacing the air filters each 3 months, and the process is straightforward and intuitive. OEM replacement filters can be found on Bissell, and generic replacement filters can be found on Amazon. The underside line: For those who are willing to splurge with a long lasting purifier https://pageoftoday.com/story2278436/purifier-or-humidifier-things-to-know-before-you-buy