Product review (2 stars): Won't last long.
This was my second time purchasing thes filters. They do the job, they filter the air/water for my ReliOn humidifier. But, they tend to brown around the edges extremely fast and begin to have a 'mildew' smell. I thought that maybe the problem was that was my humidifier was not clean enough, I hadn't used it in a year. So, I thoroughly descaled and disinfected my humidifier before installing a new filter, then made sure to soak the new filter in fresh tap water before installing into the humidifier. The next morning, I still noticed some slight browning around the top edge. Because of this, one filter will probably last me only a week (I use my humidifier every night in my kids room) and there are only 2 filters in a pack! Oh well, you get what you pay for. Next time I'll pay a little more and go with the brand name filter. Those tend to last longer.