Instruct: Classify a given Amazon review as either positive or negative.
Query: Troublesome humidifier

Output good and just a little noisier than my last ultrasonic which was a refurbished Bionare. Water gets slimy within a week, though, and cleaning thoroughly is difficult due to nooks and crannies on unit. Now unit has stopped working after only 3 months. It DID keep the room, 12 x 18, well humidified while it worked, though,