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Longevity is an important feature, which every person who desires to buy a humidifier filter will want to know of. Now, with the Holmes Humidifier Filter Hwf65, you could say this is a long-serving product for sure. With that being said, it is important you know that these products are best used in winter seasons and you could use them for a year or so. After a year, it is time to throw them and get a new piece. A really simple mode of operation at that!