Product review (5 stars): Good filters, Great price
These are very good filter replacements for my humidifier.  The 6 pack is a deal at a little over $6 each and they fit my AIRCARE MA1201 Humidifier perfectly.  The mild winter we've had in Ohio hasn't required heavy usage this year, so I've only used 1 filter so far.  I typically use a filter for a few weeks and then flip it over to put the "calcified" area down into the reservoir.  I then use the filter a few more weeks then replace with a fresh filter.  After I accumulate a few used filters I clean them with a solution of water and white vinegar.  (removes the calcification, let them soak till they stop bubbling and have softened)  Rinse well.  Clean again with a solution of water and dish detergent.  Rinse well.  Then finish with a water and bleach solution with a final thorough rinse.  Using this method I've been about to reuse humidifier filters 3 or 4 times before disposing of them with no sign of (smell or sight) of mildew or mold.  We'll see how this works with these filters, but their construction looks like they will endure this routine.