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A complete under-the-tank wet/dry system offering mechanical, chemical and biological filtration with 100% water-to-media contact for superior water quality. Designed for flow rates of 300-500 gph, this heavy-duty high capacity filter features a patented Bio-Wheel that instantly removes nitrite and ammonia, and three slide-out filtration trays housing a filtration pad, 16 oz. of activated carbon and additional media of your choice. Perfect for fresh or marine aquaria.