Achieve crystal-clear, odour-free aquarium water with the Nubios Cut-to-Fit Activated Carbon Filter Pad. Measuring 254×457×10mm (10″×18″), this premium activated carbon-infused polyfiber pad chemically removes dissolved pollutants, tannins, medications, toxins, and foul odours from freshwater and saltwater aquariums and ponds — without the mess of loose carbon granules. Trims to fit any filter in seconds.