Product review (3 stars): Seems to do the job, stains everything.
So far it seems to be extending the life of the filter, but I've only been using it (and the new filter) for a month or 2.  I don't like the pink color and how you have to be careful around everything so it doesn't stain, but it seems to do the job. I only wish it came with some sort of measuring cup so I didn't have to dole out 5 capfuls every time I fill up the humidifier.  It's filling and dumping all those capfuls that leads to the constant dribbling that I need to clean up.