1-YEAR REPLACEMENT FILTER PACK: 3 Humidity Filters for 1-year of use in the O2+ Revive are included. Specialty Filters and Standard Replacement Filters are 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.

EVAPORATIVE HUMIDIFICATION: Water particles used to humidify the room's atmosphere are small and light-weight and can travel through the air more easily and efficiently， providing an even humidity throughout the room

AIR PURIFIER AND HUMIDIFIER: The Humidifier Filter and a Humidity Sensor work together to control the amount of moisture released based on the room's temperature and humidity level. Operates similar to an air washer trapping dust and other air particles in the filter so they are taken out of the room's atmosphere

ONLY FOR REVIVE: The Revive Humidifier Filter Pack will only work with the Brondell O2+ Revive models PR50-W and PR50-B.

REVIVE REPLACEMENT FILTERS: The Humidifier Filters (PRF-52) get changed after four months or as needed along with the Specialized Filters (PRF-58). The Standard Replacement Filter Pack (PRF-51) is changed every year. Standard Replacement Filter Pack and Specialized Filters are sold separately