An ultrasonic humidifier leaves a white haze. This is because there is lime in our tap water, which is blown into the air and later settles on the surfaces. The lime filter absorbs most of the lime particles, which will reduce the lime emission. It is also possible to put demineralised water in the humidifier instead of tap water. This water contains no lime, so you will not get a white haze anymore.

When you use a humidifier without an ultrasonic element, this problem does not occur at all, as these humidifiers work on the basis of cold water evaporation.