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Purchased on January 9, 2021. Pros: The design is pretty and it's easy to refill water Cons: It's too hard to clean I get more and more angry when I clean it I washed it for an hour because it had red stains. I'll ventilate it and dry it well and use it again and write an additional review later. They say that E. coli or salmonella are likely to grow in humidifiers. If it's for sterilization, they say that a combination method is better than an ultrasonic method... Since it's a product directly related to respiratory health, I recommend that you search and compare thoroughly before purchasing... + Edited on November 29 I've been using it well after cleaning it to the point of my arms getting tired, but I don't know why it happened then. But the customer service center said that it was caused by rust in my house so shouldn't it be growing now? I think the customer service center didn't know and told me...