[onemoresoop]

This is a very good idea, it uses no external energy and can potentually last forever. It’s a very simple and efficient thing. The only thing that I wonder is if this could be washed and whether mold can form in the pores. My ultrasonic steam humidifier can be easily cleaned but it makes an audible sound that happens to not bother me.

[dugditches]

What I was wondering too. Especially with the rough surface and slits in the back. Maybe putting a small amount of Bleach in the water would prevent it.