Product review (4 stars): continued satisfaction...
I bought a ReliOn humidifier two years ago.  I have had to replace the filter only twice.  I was able to rinse out the filter thoroughly so that I could reuse it several times.  It was finally nice to get a new one.  The old one still looks like the new one but slightly discoloured.  If you have a relion, this is a good buy.  Will buy again as needed.