Pet & More Aquarium Internal Filter High Quality Water Purification If you are installing an indoor aquarium for the first time, a filtration device is one of the most important pieces of equipment you can buy. Filters are required for freshwater and marine (saltwater) ecosystems; they remove physical and chemical waste from the water. Since an aquarium is an indoor environment, these wastes and harmful chemicals have no means of natural dispersal, and therefore must be physically removed. Filters are essential to support life systems. In your aquarium, whether it is fish, plants or invertebrates Suitable for pumping and circulating water in different aquariums, Adding oxygen to aquatic pets that filter the breeding water. Filters are important in supporting life systems in your aquarium, whether it is fish, plants or invertebrates Suitable for pumping and circulating water in different aquariums