Pure-Ion BedroomTM Air Purifier and Humidifier Helps remove common airborne pollutants from the air Clean filter indicators lets you know when its time to clean the filter Humidifiers 2.6-gallon capacity runs up to 6 days on low between refilling Maximum humidifier output is 2.2 gallons per day Built-in timer lets you clean the air for periods of 2 to 12 hours, or run continuously