OF® Smart Internal Filter just got smarter with OF® 3DM Pro-Filter Medium which is a revolutionary mineral based beneficial-bacteria medium that incorporates the most advanced heating and multi-staged manufacturing techniques and technology to create this super macro-porous and tough biological filter medium. OF® 3DM Smart Internal Filter provides both Mechanical and Biological filtration that ensures organic waste and their toxic by-product are effectively broken down and provide optimum conditions for your fishes. * It is suitable for all tropical aquarium setup. Features : • Easy to use; no complicated installation required. • Adjustable flow direction. • Adjustable flow-rate. • Quiet and efficient. • Venturi Adaptor.