Review on Mumaxun 12pcs Replacement WF813 Humidifier Filter | Compatible with Relion RCM-832N & ProCare PCCM-832N, Duracraft DH-830, Robitussin DH-832, Sesame Street SH100 & SH200 by Jon Bishop

was not very enthusiastic as these filters had to be changed quite often. I don't know if the metal shielding on some other brands helps keep the minerals in check, but I've had to change these filters at least every 10 days to 2 weeks. The water here is very hard, which could be the reason for the rapid accumulation of water. I received a humidifier demineralization capsule that added a few days to the life of the filter, but I wasn't impressed. Despite treatment, the filters turn brown and become encrusted very quickly. I also found the filters to be slightly larger than the Equate brand filters I usually buy, so I had to squeeze them a little to get them into place. I don't think I'll try these again.