They can be hard to find and local head shops often over charge for bong carbon adapter filters but we found the best carbon bong filter there is.. They really work! All you have to do is put in a gauze and fill with activated carbon. The bowl will site on top and you can smoke like normal. This does change the way the herb tastes and takes away the harshness but leaves you with the same great feeling.
Roor 14.5mm and 18.8mm carbon charcoal adaptersMake smoking your herb less harsh by adding a carbon Roor adapter to your bong.