Product review (1 stars): Awful--turned water yellow, then blue
I ordered this filter because of the great reviews and because I've had good experiences with third party filters for my other Honeywell HCM350 humidifier. This filter is thicker than the stock filter and seemed to be working well at first. With the first water change I noticed the top turned yellow much faster than is normal with these humidifiers. Like many people, I flip the filter each time to prolong its life. However, this time I noticed that the yellow on the edge (now on the bottom) immediately leeched into the water and turned it a dark yellow color. I rinsed the filter and it went away but noticed the same thing happening on subsequent water changes. It seems the metal wrapper is responsible for this, because it improved after I removed it, so maybe it's rust.

After 2 weeks of use the blue layer's coloring has now transferred into the filter and slightly into the water, though not nearly as extreme as in the other user submitted image. I'm now waiting on a replacement stock filter because this one is absolutely terrible. Yes it is cheaper than the Honeywell filter, is thicker, might release a bit more moisture, and on first glance appears more durable but this is absolutely an inferior product.