Product review (5 stars): Use this with Water Treatment to extend its life.
I used to go through several a season until I discovered a treatment to be added to the water called BestAir 3BT-6 Original BT Humidifier Bacteriostatic Water Treatment. I've already gotten 8 weeks out of one of the HW75 filters and barely showing into the RED meter for replacement. No smell, looks cleaner too. I might change it now and then only burn up 2 of them for the entire Wisconsin winter.  Without that treatment, those would barely last 2 to 3 weeks and be all crusted up and useless. It also helps if you are using softened water.