Thank you for viewing. This humidifier uses clean, boiled steam, cooled to approximately 65 degrees, to humidify your room. Easy to maintain: "No filter" & "Wide-mouth container" There is some limescale buildup inside. Made in 2022 Please read the profile before purchasing. The price is reviewed periodically, so please refrain from price negotiations. If you can pick it up in person, I will discount it by 1000 yen (within Yokohama city).