Steam - you can pour water from the tap. I fill it from the filter, scale still forms, you can clean it with citric acid. Unlike ultrasonic, there is no fog and salts, from which the air and surfaces in the apartment are heavily polluted.
Pros below:
- sterile steam, which means the absence of bacteria during the evaporation of water as in ultrasonic
- perfectly and quickly moisturizes
- beautiful, very unusual design
- simple to impossibility, works on the principle of a teapot. It does nothingSee full review