Extremely versatile and customisable, the Protege P4000 External Aquarium Filter and Pump series hold large amounts of mechanical, chemical, and biological filter material in varying combinations to provide you with the ultimate filtration. The result is maximum flexibility to create a unique filtration system suited for your needs. The Protégé Ultra Series delivers a smooth consistent flow of water to pass through the filtration system. It provides the water flow that is vital for effectively distributing oxygen to fishes and other aquarium inhabitants. Aside from aeration and water circulation, the pump can also operate ornaments and create currents inside the tank. Mechanical Filtration - Add mechanical filter pads to effectively remove unsightly particles from the water, including fish excrement, sludge, uneaten food and dust. Chemical Filtration - Adding activated carbon and resins will remove various pollutants including dissolved organic compounds and keep the water crystal clear without odour. Effective at removing impurities such as copper, chlorine, dissolved proteins, medications, tap water & impurities. Perfect for sensitive fish and invertebrates. Biological Filtration - If you have a heavily stocked aquarium or a very large fish that produces a greater amount of metabolic waste, just add biological material. These very porous ceramic noodles and bio balls allow efficient biological filtration to effectively process ammonia. Buy now! Protect and extend the life of your valuable & unique fish! Assembly Required