We used this air purifier in my children's nursery from birth to 1.5 years, when it started pumping out black spores. We're not sure whether it molded inside or what, but there is a black fine dust all around it. We regularly cleaned the filters. Also, it is emitting a smell that is putrid - rotten pancake syrup? My children do not have access to this purifier, so I know it was nothing they did to it. I do not recommend this air purifier.