The AquaClear 50 Power Filter provides mechanical, chemical and biological filtration through its multistage filtration system. The filter filtration volume is up to 7 times larger than comparable Filters. Its unique design filters aquarium water through a natural and silent waterfall. The patented flow control feature allows for customized filter performance. The filter preserves beneficial bacterial creating a stress free environment for aquarium inhabitants and maintains clear aquarium water. Installation and maintenance are quick, easy and convenience. The AquaClear 50 Power Filter is ideal for 76 to 190 L (20 to 50 U.S. gallons) aquariums.