I bought a Honeywell HWM450 humidifier in early January. I use it and check if it needs cleaning and wasn't dirty enough to need it. My previous humidifier, which I used without these pads because I wasn't familiar with them, got a lot dirtier and needed a lot more cleaning. (both types of warm fog). At the beginning of March I had to clean it for the first time, before that I only changed these pads when they were dirty, for about 1-2 weeks, and the first time I didn't even replace them, just washed them clean. . It only seems to work once after which the pad starts to sag and doesn't fit well but even if I didn't they are so cheap they are worth it. After seeing how they work I want to order more than 1 box of 12. I will order them again.
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