Product review (5 stars): Worked for me!
I have a Vornado Evap 2. This product came in a Vornado branded box, contained 2 filters, and they fit exactly as the OEM one I had removed. In general, I wouldn't so much call this a "filter," although it filters a bit. It is, however, an integral part of the humidifier. With the humidifier in general I found it best to fill the one gallon only once per day. That way the Wick always dries out completely, and doesn't mold up right away. My first filter lasted 3 weeks before giving me a moldy fishy smell, but the second, after letting it dry out each day, and using one tiny capful of teatree oil with each fill, the second filter has been in there for 7 weeks with no issues so far.