Keep your water clean and clear with the Aqueon QuietFlow 30/50 Carbon Reducing Specialty Aquarium Filter Pad. These carbon-filtering pads are pre-cut to fit in the Aqueon QuietFlow 30 and QuietFlow 50 LED Pro Filters and come in a handy pack of four. They help remove pollutants and organic debris from your aquarium water to keep your finned friends' abode crystal clear and decidedly un-stinky. Your fish will positively wiggle with joy!