To ensure optimal operation of your New Vapolux, it is important to change the filter regularly. This Lanaform New Vapolux spare filter is specially designed for this model of cold water humidifier. The filter prevents limescale formation in the device. Lime that would otherwise end up in the air through the vapor from the device. To ensure that your New Vapolux continues to work perfectly, it is important to replace the filter once every two to three months.