Fluval Spec Carbon 3 pk Filter Media x 12 Inner Case 36 count Flurval Spec Replacement Carbon packs Specifically designed for Fluval Spec Desktop Aquariums This premium, activated carbon provides critical stage 2 chemical aquarium filtration The research grade carbon has large amounts of surface area for the adsorption of impurities High quality chemical filtration keeps your fishes' water crystal clear and helps keep your fish healthy