Product review (5 stars): Nice filters  reusable, too
I bought these for my cool mist humidifier. They are VERY efficient.  What's great is I can pop out one to wash in the sink w/mild shampoo & use another while the 1st 1 dries. When it's time to switch, I repeat the process.  I've stayed with the same 2 filters,washing them weekly ( our pets kick up a lot of dust.) Very sturdy & super effiecient.