Product review (1 stars): and had been very happy with them
I've been buying these for some time on Amazon, and had been very happy with them.  The ones I received were always the OEM versions and had a long life time (approx. 1 year).
Recently, every filter I've purchased has smelled after around 1 month of usage, and this caused my entire home to stink when the HVAC / Humidifier cycled.  I didn't realize what was going on at first, but finally came to realize that after drying and wetting cycles, the clay simply stinks - like bad clay smell.

I don't know if something changed in the manufacturing process, or it's some new clay, or something else I can't fathom.  All I know is that I can no longer use these panels.

I've been forced to switch to a competitors brand, without the clay.  Very disappointed.