⭕️ Used in a smoke-free environment. Used for about 8 years, only in the bedroom during the winter season, for a total of about 2 weeks per season. ⭕️ When not in use, the water was drained from the tank, and the unit was cleaned with a brush to remove limescale, then dried and stored. ⭕️ I think the last time I used it was about six months ago. ⭕️ There are scratches and stains on the surface, and some parts of the filter on the back are torn. The white area near the air outlet has discolored to a pale yellow. ⭕️ The blue filter has been replaced once with a compatible new one. It didn't quite fit, so I cut it to size with scissors and installed it myself. "Product Name" 【T660】Sharp SHARP KI-EX55-W Humidifying Air Purifier High-Density Plasmacluster 25000 #Sharp #HumidifyingAirPurifier #SHARP #AirPurifier #Humidifier #KI-EX55-W #Plasmacluster