Make the most out of your BISSELL MyAir personal air purifier by replacing the filter every 3 months. Regularly replacing your machine's genuine BISSELL replacement filter means our air purifier can continue capturing pollen, dust, pet dander, odors, and VOCs in the air. BISSELL proudly supports BISSELL Pet Foundation and its mission to help save homeless pets. When you buy a BISSELL product, you help save pets, too. We're proud to design products that help make pet messes, odors and pet homelessness disappear.