An 'ion' and Ozone are so incredibly tiny that you can't just filter one out. Additionally, an 'ion' refers to the state of an atom or molecule with a missing or additional electron.
There may be a method to do it, but I'm sure it's more than simply putting a cloth over top.
Ok thanks, I read that ions last longer than ozone (although still not very long). So I guess the solution is the distance it is placed away. Although I'm not sure how to work it out so I'm just putting it on the edge of the room.