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This filter is hard to find, as the other reviewers state. It does not come ring shaped. Rather, it is shipped flat, with a couple of folds. You have to reshape it to fit in the humidifier.
Also, it is a tad small. You cannot form a complete ring with it. That probably reduces the dust reduction factor of the humidifier, which is one of advertised factors in the listing ("virtually eliminates dust").
However, since the original filter that came with the humidifier was a perfect ring of the perfect size, the customer is being short changed with this product. There seems to be no alternative to it, however.
Update: I recently (Mar 24) purchased two MAF-2 Essick Filters at homedepot.com less expensive and exactly the right shape and size. Fit easily into the humidifier just like the original one. So, I would say, get this only if the homedepot one isn't available.
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If you want your humidifier filters to last longer, then use filtered water and an additive to the water to prevent bacteria, as well as mineral build up. We use Golden Solution Combination by Vista Solutions. And if you want to pay a much cheaper price for these filters, go to Lowe's and look for IDYLIS Universal filters. They are currently $8.98 each. We have an Essick Moist Air Humidifier model 12010, and these filters fit fine, though they are boxed flat and have to be shaped...
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Unfortunately, I can;t get the filter in the local stores any longer. However, this buy was essentially fair priced, and filter works as usual. I like the humidifier, so I like this filter to help me keeping it running.
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I've bought several of these, and they work, gradually collecting hard water minerals until they don't work any more, after a couple of weeks (depending on your water). The only complaint is they always smell bad when I first use them, so I break them in in a small closed off room.
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I love my Essick Air humidifier, but am seriously displeased with the absurd price for these filters. The margins on something like this must be in the stratosphere. Also, I am beginning to question the design of the humidifier itself. It is impossible, especially given the use of water decontaminant, that the impurities that clog the filter simply materialize like magic in the water. They come from the room atmosphere itself. The degree to which the MA0800 is exposed is unnecessarily high and causes additional impurities to be pulled in by the inspiration of the fan, clogging the filter (which is not high enough to prevent these same impurities from being kicked right back out into the air) to just collect filth faster, leading it to clog and prevent the humidifier to function effectively.
The box indicates that the filter should be changed "once per season." This is nonsense. The first filter clogged to the point of basically rendering the humidifier totally ineffective after only a month. It worked flawlessly again as soon as the filter was replaced, but I'm pretty dismayed at having to order more of these things after such a short time. There is nothing extraordinary about the room I've got this thing in, nor is the water I'm using (purified tap) particularly hard. Within a few months, I will easily spend more on filters than I did on the humidifier itself. Pretty ridiculous and annoying.
