Fluval Spec Activated Carbon. Specifically designed for Fluval Spec Desktop Aquariums, this premium, activated carbon provides critical stage 2 chemical filtration. The research grade carbon has large amounts of surface area for the adsorption of impurities. It effectively removes heavy metals, odors, discolorations and pollutants, leaving your aquarium water crystal clear and sparkling. This package contains 3 bags of activated carbon. Key Features: Specifically designed for Fluval Spec Desktop Aquariums Premium, activated carbon provides critical stage 2 chemical filtration Research grade carbon has large amounts of surface area for the adsorption of impurities Effectively removes heavy metals, odors, discolorations and pollutants Creates crystal clear, sparkling aquarium water Contains 3 bags of activated carbon.