Steam from boiling water is mostly pure water plus anything else that can evaporate. Dissolved minerals and salts stay behind in steam unlike mist from ultrasonic humidifiers. Those type vibrate the water so quickly tiny particles of water break off to form mist which is then blown by a fan which means any dissolved minerals will also break off with the water. That’s why these humidifiers tend to leave white dust behind and causes gas burner stoves to burn yellow due to the sodium content in the water.
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