Read more: http://www.lenntech.com/library/adsorption/adsorption.htm#ixzz0iEA0nCB3 WTF? THC and cannabinoids are very non-polar. Anyone who has taken a chemistry lab and has used activated carbon knows that it has a high affinity for non-polar organic compounds. THC and cannabinoids are extremely non-polar. Activated carbon is also used to remove phenols. Activated carbon is also useful in odor control and water purification to remove taste. A large number of taste and odor compounds come from large bulky aromatic ring molecular structures and tannins. AC also removes large bulky molecules that do not have a thin shape. So whats the point? Cannabinoids are terpenophenolic compounds. They also have very bulky ring structures that make them very easy to get stuck inside of the AC pores. In other words, AC is designed to filter out compounds that resemble cannabinoids. ROOR uses dry AC but it makes no difference, the principles are the same. The reason there is so much less taste is because of less tannins/cannabinoids. So my completely blitzed self went out the next day and picked up some wet AC at Petco for $10 that they use for aquarium filters. I filled up the beaker bottom of my bong with AC and put just a little water in so that when I took a hit no bubbles would jump out from the activated carbon slurry. Now why the hell would I do this if AC seems so flawed? Simple answer- it's healthier- the majority of small smoke particles are removed, carcinogens removed, and much cleaner hits with a crystal clear high. The taste is lighter but seems to be much more fruity and I can really taste the differences in strains. I really didn't notice a reduction in being high, maybe because of all the shit that is filtered out so the cannabinoids contact a greater surface area of the lungs that arent clogged with crap. But what about all of the lost cannabinoids that were absorbed by the AC?There is a solution . When the AC starts to get old, I will just pour it into an open ended PVC pipe with a screen at the bottom and will use a butane extraction to make hash. Butane is sprayed into the top of the PVC pipe. Butane is normally a gas @ STP and will act as a liquid solvent and will saturate the AC pulling off the nonpolar cannabinoids. As the butane evaporates, the sticky hash is left behind. I will give this a try and will let you guys know if any killer hash can be extracted. And one last thing, use an ash catcher so that ash and big chunks of herb don't end up smelling and rotting in the AC.