Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Humidifier Filter

A very good filter - easy to install - and lasts for a few weeks with constant use.Be careful though - make sure you turn it over at least once a day and if you can, leave it to air dry for 2 hrs - it really extends the life of these filters.Order a couple at once ( save yourself the shipping!!) as amazon can run out in the winter - a definite buy for the HB humidifier