Carbolit – 400 grams/4 mm are ctivated carbon pellets, 4 mm in size, for fresh- and saltwater aquaria. carbolit comprises of highly efficient activated carbon pellets. Carbolit quickly clears aquarium water and removes coloring substances, turbidity and medication residues. Yellowing substances such as phenols and tannins that can accumulate in the water are also removed. Carbolit may also be used as a long-term filter material. Carbolit is pH neutral.