With a lifespan of up to 1 year, this filter traps airborne allergens such as pollen, pet dander and dust while eliminating industrial, household and vehicle fumes and emissions. such as formaldehyde, benzene, and other cleaning chemicals as well as various household odors. It's easy to replace too since the top of the OxyPure HEPA easily comes off. The replacement filter even has handy tags that help you easily slide it into place with minimal effort so your OxyPure can get back to cleaning right away.