Product review (1 stars): Dont bother. Spend the extra few bucks on real ones.
I put these in my kids Vicks Starlight Humidifiers, when I went to add more water the next night I always quick rinse the filters for longer usage and noticed they both had already deteriorated and basically turned into mush. When I emailed them abountjey reassured me it was a bad batch and said they were sending new ones

I never got new one and never heard back from them.