Tetra has been revolutionizing and improving fish nutrition since the company???s birth in Germany in 1951. Since that time, Tetra has developed one of the most comprehensive bodies of flake fish food knowledge in the world. A full team of biologists, chemists, and nutritionists continually study and discover what keeps fish thriving and living long, healthy lives. Tetra has likewise applied this level of scrutiny to a line of supplements that offer variety and extra nutrition to fish. The Tetra Whisper Internal Power Filter provides an effective combination of mechanical and chemical filtration for cleaner water and healthier fish. You'll love the full two year warranty, the easy ability to set up and clean your filter and the powerful 170 gallons per hour submerged motor as it barely makes a sound.