Hi @Jayss0
Could you provide a bit more information so that people here in the community can better understand and advice you?
Maybe I"m stupid, but i'm not sure what a water filter screw is and how it can automatically fall down.
I'm also not sure if you told your host about it or not.
Either way, waiting for a whole week before contacting you does seem rather odd. How much is the host asking for? Do you know if more guests have checked in since you checked out?
All this information would be helpful
Regards