If you believe our thermohygrometer, then in mode 2, the room (20 squares) humidifies up to 55% in about two hours, then you put it on mode 1 and it supports, it did not fall below 50. I am not picky about water, but we try to pour it from an ordinary water purifier, from a tap, well, in general, a lot of rust collects. On mode 2 it makes noise, quieter than a kettle, but it prevents my wife from sleeping, so at night - mode 1 and sleep, breathe humidified air.
As I wrote above, the description