Product review (5 stars): Generalaire Humidifier Pads
This is as about as good as you can do for these pads. They are exactly like the pads that came with my humidifier and fit perfectly. There is some kind of powder coating on them, I think to hold moisture. Some of the powder does come off, that you will see when you take the pad out of it's packaging, but it is not some kind of nefarious plot. It's been on all the pads I've ever seen and it's not enough that it ever blew through my heating system. (One reviewer seemed to have a problem with the powder.)

You can trust these humidifier pads.