1. It's not pellets actually; it's the "grain" type, used in aquarium filters. It is widely available.
So no ground powder; it will make a mess.
Fill the bowl with the AC grain and alcohol. The alcohol will evaporate within 24 hrs. and leave a clean odorless bowl.
The AC has taken the odd smell, is bone dry now and can be dumped. You can of course repeat the treatment.
2. No mess, like with salt or coffee ground. And no change of your bowl being ghosted with salt, or CG.
Vinegar and cotton balls work fine too !
After many years of experimenting the AC has proven to work best and cleanest.
I hope this makes sense; I'm tired and my English is wonky
As stated before; usually the ghosting is mainly in the shank.