Marineland Penguin BIO-Wheel Power Filters provides mechanical filtration to screen out dirt and debris, chemical filtration to remove dissolved organic compounds and biological filtration to eliminate toxic ammonia and nitrite on contact. No pumps, valves or tubing required. Includes a free filter cartridge. It silently filters 200 GPH for freshwater or marine aquariums up to 50 gallons. Shipping weight: 3 1/4 lbs.