Offering outstanding 3-stage filtration, increased water movement and vital aeration, Fluval U-Series internal filters are the perfect solution where external filtration is not possible. Now with new and improved design features! Key Features: New sleek design New easy grip water control paddle New redesigned media cartridge Traps more debris Designed for aquariums up to 150 L (40 US Gal) Use as a primary filter for smaller aquariums, or supplementary filter for larger aquariums Position horizontally for shallow tanks, larger tanks with low water levels, or to create a decorative waterfall feature Position vertically against aquarium wall to create currents or customized flow patterns Convenient flip-top lid allows for quick and easy access to filter cartridge for maintenance or replacement Adjustable 3-way flow control: Top output for circulation and oxygenation, integrated spray bar for a gentle even flow, and bottom output for deep-water agitation BioMax biological media included Made in Italy Ideal for freshwater, saltwater and reptile environments