This is the second and last Bionaire Hunidifier I will own. This one barely meets (?) the specification for hunidifying the space. The product appears to perform but the amount of water evaporated seems paltry. Humidity cannot be maintained in the space in which I employ it, well under that specified for its use. I disassembled the unit to check the humidifier pad and found 2/3 of it "bone dry". I have only used the product for 1 month. The filter replace indicator marginally indicated the filter should be replaced.