Instruct: Classify Amazon reviews into positive or negative sentiment
Query: expensive filters with short life

They say the filter will last 3 months, but it only lasts about 2-3 weeks. I use this humidifier in my dry NYC apartment, and it definitely works well. It's nice and quiet too, but I have spent WAY too much money on these filters!! And I clean the tank MORE often than recommended, and flip the filter every day as recommended! Why should you go broke just to have a bit of humidity!? BUY SOMETHING ELSE!