1-YEAR REPLACEMENT FILTER PACK: The Active Carbon Filter and both True HEPA Filters needed for 1-year of use in the O2+ Revive are included. Specialty Filters and Humidifier Filters NOT included (sold separately)IT'S NOT JUST AN AIR PURIFIER. The Revive is a premium TrueHEPA air purifier and unique humidifier. Don't just filter your air， refresh it with the Revive. Adding moisture to filtered air not only helps relieve allergy symptoms， stuffy nose and sinus congestion， but it also effectively relieves dry skin and reduces asthma symptoms. Super-efficient evaporative humidification makes for a more consistent humidity level and wont over-saturate the immediately-surrounding area.

True HEPA filters: moving air through dual True HEPA filters， that remove 99.97% of particulates and allergens larger than 0.3 microns， makes your air cleaner and fresher so you can breathe easier

Active carbon filter: the active carbon filter has a honeycomb structure to ensure full coverage of granulated carbon throughout the filter to trap and remove odors， harmful gases， and VOCs

Only for revive: the revive standard replacement filter pack will only work with the Brondell O2+ Revive models PR50-W and PR50-B

Revive replacement filters: the True HEPA filters and active carbon filter are changed every year while the specialized filter (PRF-58) and humidifier filter (PRF-52) get changed after 4 months or as needed; specialized filters and humidifier filters sold separately