Product review (1 stars): Absolutely terrible -  do not buy!
I purchased these filters two times hoping that maybe the first time I just got a bad batch.  I  also purchased another size for my other Vornadohumidifier.  After the first week or so of the filter completely started to disintegrate and dries out and turns brown.  I tried flipping it, then the second time I bought them tried not flipping it. Each time even with full water and not ever letting it run out of water, the filter just disintegrates and stop putting moisture in the air. I even bought a humidistat to check to see if it was doing anything and its absolutely not. I have the Vornado single canister. Its not my water because Ive bought other non-Vornado replacement filters that worked but they were out of stock, so I thought it would be better to have the OEM version.  I was wrong. These are very expensive for one filter at $15 when the entire humidifier only cost $69,  ive now spent almost half the cost of the unit and I have to go buy more.  I also have the double tank energy saver Vornado and bought the Vornado  replacement filters for that one, and exact same thing happened. I purchased a non-brand Replacement, and those are working great and have silver mesh to keep them from falling apart, and they don't dry out or disintegrate.  Im going to be contacting Votnado directly for a refund since the Amazon window is only 30 days which I missed by a day.  I absolutely would not recommend these filters,  and with all the poor reviews I cannot believe Amazon continues to sell these, or Vornado has not done something to make this right.  The first two photos are the single canister, and the second are the devil canister with the non-Varnado shelters that work great. Those are also from Amazon