The Marina i110 is an internal filter for use with any goldfish or tropical tank up to 100 liters. Complete 3-stage filtration (mechanical, chemical, biological) is provided with a uniquely designed Power Cartridge.The power cartridge features polyester foam to trap fine particles; while the inside chambers contain carbon to remove pollutants and odors; zeolite to eliminate toxic ammonia for a cleaner, healthier aquarium environment and crystal clear water.