Product review (1 stars): No way...
I've observed this product very closely over a year's time and consider myself highly knowledgeable. That is not bragging, just the result of having to dust inside my closet, and hating every second of it.

I hesitate to say nothing's happening with these catridges but I'll just say, I changed the cartridge once a month - there was white mineral dust before I bought these, there was white mineral dust after I bought these. Was there less as a result - maybe a tiny fraction less - but there was still a significant amount, enough that I needed to dust my closet (that includes finding dust INSIDE a expensive printer that was INSIDE the closet).  If you want to know what your money is being spent on, you can buy a meter to read the mineral content of water for about $15.  I bought such a meter but only after I gave up and switched to the granules, then gave up on the granules and bought a reverse osmosis system. (The reverse osmosis system gets the TDS level to zero, a.k.a. no dust.)

I love my Air-O-Swiss humidifier but if you want to eliminate the white dust, this is not the way - invest in a reverse osmosis system. Too bad Air-O-Swiss doesn't make one.