Product review (3 stars): They work, but don't last long
I ordered these in lieu of the name brand that matches my humidifier, because they're less expensive. You can expect that they don't last as long as the name brand. My least favorite thing about these is that they have some kind of metal ingrained in the middle of them that causes the filter to rust/mildew. They work for my humidifier, and they don't give me many issues. Overall, I probably won't purchase these again, because I prefer the other brand.