You can wet tumble without the media and get results that are probably 90% as good as with it, but without having to buy media or deal with separating it from the cases.
This ^
I have the FA wet tumbler and rarely use the pins anymore. I'm doing mostly .40sw brass and it comes out good enough after 1 1/2 hours.
Two long squirts of Dawn dish soap, some Lyman case cleaner liquid, a dash of Lemishine and you are good to go. Dont fill the container all the way up with brass. Maybe 2/3 full at the most. Some primer pockets are not perfectly clean but they are good enough.