water, the most optimal here would be to use purified water with using reverse sedimentation. as tatyana shuntova, a company specialist who sells humidifiers, explains, some models have filters that remove hardness salts from water, the main thing is to change the special resin or the cartridge itself on time. well, if you don’t want such complications, you can choose another type of humidifier, for example, a steam one, it doesn’t leave a residue, because it works differently: inside, like in an ordinary saucepan, water boils and only it evaporates; salts are not capable of this. at the output we get water vapor, that is, h2o molecules, unlike an ultrasonic humidifier, which crushes water into small droplets with its membrane. flood. you can use simple tap water here, but such a humidifier consumes more electricity, but caution does not hurt, we hear it gurgling and feel that there is quite hot steam here, it even says caution hot steam, the instructions say not to sit on it if it suddenly occurs to someone, well, in reality it can burn, the steam doesn’t burn, as you can see, i’m holding my han