Product review (4 stars): Good bacteria/algae control for vornado filters
I've had a problem with the vornado humidifier wicks/water growing orange algae and becoming quite stale and brown on high humidity days in the winter.  I was replacing filters a number of times through the winter and cleaning out the humidifier pan.  This has been great at solving that problem, I use about 1/2 the recommended amount.  I was previously using a drop or two of bleach to try to keep the water clean but that was not so effective.