If you do not filter the water, then you need to periodically wash it - the water "goes bad" - a sticky sediment appears on the walls of the container. Water-salt deposits appear on the discs. With its pros: Leaves no residue like ultrasonic humidifiers. Multiple speeds. Its cons: Does not connect to Wi-Fi - the biggest problem (as it turned out - not the most). It failed after six months of work - it squeaks when turned on, shows a minimum of water and does not start further. I took out the sensor, looked, in general, there is no plaque. The problem is somewhere in the brain, apparently, and for this you need to disassemble, and in general it is not clear what is next.
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