Product review (1 stars): Worst product I've ever bought on Amazon
After one week of use, it was already showing build up.  I used the kitchen sprayer to clean it out as instructed.  The inner layer began to come detached, but it cleaned out.  Now, after another week of use, it has disintegrated to the point it was preventing the water tank from shutting off (as it got in the way) so my humidifier leaked all over my bedroom floor and all over the electric cord, endangering me and my kitten since I use a water treatment to prevent build up.  I'll be filing a claim.  Update: contacted seller and they have the nerve to want me to pay to ship it back.  I'll happily ship it back, but shouldn't have to pay.  Offered to send pictures of it.