For the price, I don't think you can find a better humidifier than this one. Two of these, in separate rooms, are mine. effectively moisturizes, operates faultlessly, and caused no issues. Only this once, A! We didn't give it the weekly cleaning it needed or add any new water. and the stench of the unclean, nearly-finished water permeated across the room as he labored. wash weekly, check water quality often, is the logical conclusion. How far away from the road your flat is and how much dust there is in it both affect how clean your water is. Negative aspects: washing hurts my. It's important to scrub each dish thoroughly on all sides. Your health is at stake, so don't slack off.