Product review (1 stars): Bad news product
This replacement filter suddenly began to emit a really foul odor.  I soaked it for ten minutes as per the instructions but when I put it back in, the odor came back and my eyes started to burn.  I realized I had to throw the thing out, which means I have no humidifier while the air is now very humid.  Meanwhile I had to open the windows, with the temperature about 10 degrees outside, to get rid of the pungent odor and the sensation in my eyes - still not gone, several hours later.  They need to re-do this filter, it is a Zero.