Keep your aquarium clean with the AquaClear 50 Power Filter, which has a filtering capacity of 200 gallons per hour. With its multi-stage filtration system, it is appropriate for aquarium with a capacity of 20 to 50 gallons. It has a built-in flow-control feature to control the water intake and flow. The Cycle Guard with BioMax maintains beneficial bacteria for aquarium inhabitants. It also has Zeo-Carb and ammonia remover.