This powerful filter contains patented rotating Bio-Wheel technology to provide superior wet/dry biological filtration for neutralizing bacteria growth and eliminating toxic ammonia and nitrate fast. As it rotates, the Bio-Wheel exposes beneficial bacteria to the air, helping bacteria work harder and faster to keep your aquarium ammonia-free. The Bio-Wheel never clogs or needs to be replaced. All Bio-Wheel filters feature noise-reducing, two-piece vented covers and adjustable mid-level intake strainers. Uses our Rite-Size Filter Cartridges with Black Diamond Premium Activated Carbon to filter out dirt and debris for maximum water clarity. Available in five sizes: 75 GPH (for aquariums up to 10 gallons); 100 GPH (for aquariums up to 20 gallons); 150 GPH (for aquariums up to 30 gallons); 200 GPH (for aquariums up to 50 gallons); 350 GPH (for aquariums up to 70 gallons).Clean, sparkling water is the mark of a healthy, thriving aquarium.