Venta LW15 Airwasher 2-in-1 Humidifier and Air Purifier in Black Humidifies dry room air while simultaneously purifying it by removing dust, pollen, pet dander, and other allergens No filter or replacement items needed to operate the unit - water is the filter No "white dust" common with other humidifiers Auto shut-off with water refill indicator light - 1.4 gallon capacity 10- Year Warranty Compact, efficient, and powerful for indoor air spaces up to 200 sq. feet.