Product review (4 stars): Filters work great
Yes they aren't the cheapest, but they work.
I lived in northern Wisconsin in 2800 sq foot home with a large stone fire place and the first year I had the humidifier we set a record for 70 plus days in a row below zero so I used the heck out of the fire very place.
Wood heat dries out a house like crazy.
My house was all wood and tile floors, and then natural wood walls and even ceilings.
In used 2 sets of filters that year running humidifier on high the whole winter.
I do use the water treatment.
The filters are a tight fit, take your time.
But all and all these filters trap dust etc.  If you don't want to trap anything go get different humidifer with generic or no filter.