Product review (4 stars): Easily swapped filters makes it simple to ensure good air quality and humidity.
I own the Vornado Evap3 Whole Room Evaporative Humidifier and periodically I like to get replacement filters. I only use the humidifier during the heating seasons once the house dries out and the heating cycles become regular enough to dry out the air. The filters are effective and easy to replace and require just a few minutes to swap. Ideally it is best to wait for them to be dry so I prefer to do this at the beginning of the season or after the unit has been off for a prolonged time. I've tried an antibacterial solution additive for the water but if you just use the humidifier for one season I suspect it is better to just replace the filters as they are fairly inexpensive. The Evap3 intake vents bring in a fair amount of dust and other particles and you can see the buildup on the sides of the filters. The edges of the filters tend to fray slightly and small pieces can fall off leading to a slight cleanup. Like many filters I fear the day they will stop making them and I'll have to turn to a different unit. Overall, it's a good investment to keep the unit running clean and providing a healthy mist.