Product review (3 stars): Works ok, could use a bit of improvement though
These filters typically work pretty well. I have a few qualms with this particular product pack though.
1) There is a filter life indicator on the humidifier model that we own.  Even when installing these filters brand new, it still complains that the filter needs replaced.
2) I'm not sure why these come as a 3 pack, maybe some humidifier models use 3 of these filters at once?  My unit only has 2, so I'm not really clear as to why they come with 3.  Maybe some more instructions in the box would be helpful here.
3) These typically only last maybe a couple months at best, depending on use.  It would be nice if they made ones that will wash clean in the dishwasher.  If you leave them sitting in the humidifier for more than a few days it can collect mold spores inside also which is very disappointing.