The Fluval FX6 external filter features a multi-stage filtration system that allows for precise stacking of filter media in the combination best suited for the aquarium. This ensures unrestricted flexibility in creating and maintaining the ideal environment for fish. With its enormous capacity and powerful integrated motor, which circulates a full 2300 liters of water per hour, it enables precise adjustments of water parameters in aquariums up to 1500 liters. It can hold up to 5.9 liters of filter media while remaining compact enough to fit in almost any aquarium cabinet. Thanks to Fluval's unique intelligent pump technology, the self-priming system allows the filter to be simply plugged into the power supply, and it starts automatically. The filter then fills with water, briefly pauses to release trapped air, and immediately begins the filtration process. Filtration continues until the unit is unplugged. Every 12 hours, the filter pauses to release any air that has entered the system, maintaining the vacuum necessary for maximum efficiency. Additionally, the Fluval external filter features a connection for refilling the aquarium.