Product review (5 stars): It helps, but not enough.
This unit is identical to the one that came with my Stadler humidifier. Whether new or old, I think it's a bit inadequate. I still get quite a lot of white dust around the Humidifier unless a prefilter the water beforehand. I ended up just installing some water filters under my sinks to filter the cold water taps and only fill the humidifiers from those. That was pretty cheap and easy to do, plus now the tap water tastes a lot better.

That said, these are a bit overpriced for hardly being noticeably effective and falling far short of what's needed. The manufacturer needs to redesign these to do far more than the current design.