Marineland Penguin 100 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. Designed specifically with smaller aquariums in mind, it requires only 5 inches of tank space. Includes a free filter cartridge. It silently filters 100 GPH for freshwater or marine aquariums up to 20 gallons. Shipping weight: 2 1/4 lbs.