[sixtram]

We use an ultrasonic humidifier all the time. At the same time, we use only distilled water (we distill it at home every 2-3 days).

First, this removes minerals from the water, so the room isn't covered in "white dust" after using the humidifier. But even with this, biofilm can build up inside the machine, which is not visible, but you can touch it. I also remember that when I used just plain tap water, the biofilm built up faster.

This article definitely hit me, I realized that we need to clean the humidifier more often.

[roxolotl]

How do you distill it? Do you have a machine purpose built for water distillation or some other method?

[sixtram]

I use a 4 liter home distiller. Without specific brand just google "home water distiller 4l".