The powerful AquaClear 50 filter features a unique multi-stage filtration system that provides complete mechanical, chemical, and biological filtration to ensure high water quality. The filter has a filtration size up to 7 times larger than similar filters. It also allows superior contact time with the filtration media. The filter maintains beneficial bacteria, creating a stress-free environment for aquarium inhabitants and keeping the aquarium water pure. Its unique waterfall design enables filtered water to return to the tank quietly, gently breaking surface tension and creating beneficial oxygenation.