According to many aquarium chemical and filtration specialist companies, activated carbon can become reactivated even after it has been used. Activated carbon works by absorbing chemicals into the tiny pores that lie in each granule. The pores on the carbon eventually become clogged and will no longer absorb. After this happens, the hobbyist can empty the media reactor onto a baking sheet and cook the carbon. The material within the pores will evaporate and bake out, reactivating the carbon and making it usable once again. Of course, with each reactivation the carbon becomes less effective, but it can prolong the media for some time.