Red Sea Reef-Spec Carbon is the ultimate choice for marine & reef aquariums due to its unique technical characteristics. The carbon's granule size and its micro/macro porous structure, ensures a very high total adsorption capacity and rapid extraction of the specific organic pollutants that are found in Reef aquariums. Reef-Spec Carbon has extremely low phosphate leaching and minimal ash content while also not affecting the pH of aquarium water. Reef-Spec Carbon needs replacing less frequently than carbons that are not reef-specific or are of a lower quality and represents an effective, cost-efficient solution for providing the very best water quality in marine & reef aquariums. Main features: Rapid removal of organic pollutants, High total adsorption capacity, Ultra-Low phosphate output, Ultra-Low ash content, Suitable for Marine & Freshwater, Filter Bag included.