Product review (1 stars): Like many other buyers
I ordered 3 of these filters on Amazon (through a company named Filters-NOW) to have available for the future. I didn't need them until recently. Each filter lasted less than a month before the wick formed a hard crust at the top and became unable to absorb enough water to put out humidity. The filters didn't come in the expected packaging with an identifiable manufacturer; just a clear plastic bag. I wasn't aware until use that they were clearly NOT the filters I had used previously, although they were called "MAF-1 Emerson MoistAIR Humidifier Wick Filter" in Amazon's ad copy.

I expected that Amazon vetted their partners and products. Like many other buyers, I am incensed that they did not do so in this case!