Is a chillum a down stem with a bowl on it and a down stem is just a tube and the bowl is removable? And can you use a chillum in a bong
A chillum is just a pipe. It has a bowl and a mouthpiece on the other end. You cannot use it as a downstem. A downstem has a female end for a bowl to go in, and then the other end goes into the water in the bottom of your bong/bubbler