The product "Carbon" by Eheim is a high-quality activated carbon specifically designed for use in freshwater aquariums. Weighing 225 g, this activated carbon provides an effective solution for improving water quality in aquariums. It is designed to remove pollutants, odors, and impurities from the water, creating a healthy and clear environment for aquarium inhabitants. The product dimensions are 140 mm in width, 73 mm in length, and 177 mm in height, making it easy to integrate into various aquarium configurations. Eheim is known for its reliable aquarium technology, and this product is no exception. It is a valuable addition for any aquarium owner looking to optimize water quality and promote the well-being of their fish and plants.