Product review (2 stars): our water!!!
Our water is so heavy in calcium that even a new filter won't get it all out, and after a months use the filter has long been past the need for changing. It leaves white dust on everything, clogs the central air filters in short order too, with them 30 feet away, in 10 foot ceilings. So it's something to think about when it starts affecting your air system, it can easily get to the point that bumping the humidity up just isn't worth it.

I guess my point is, learn what the amount of dust is telling you and be prepared to put many filters in during a dry Winter if it is required. It's got me to the point of thinking hard about a water softener system, though I hate taking a bath in it!!