Black Leaf Carball Activated Carbon AdapterThe 'Carball' from Black Leaf is an activated carbon adapter for bongs for filtering the smoke. The adapter with roll stop, here design 'Cylinder', has to be filled with activated carbon and then placed between the chillum and the bong bowl. The activated carbon filters out a large amount of harmful condensates and tar from the smoke without affecting its effect. The smoke tastes milder and it is more gentle for the lungs. It keeps your pipe clean