The activated carbon filter pad replaces loose carbon in your aquarium. Our charcoal filter pads perform the same duty as activated carbon granules without the mess of spilled carbon and carbon dust particles in your aquarium. Cut your aquarium carbon pad to fit your filter, rinse, and it is ready to go! .The carbon filter pads can be CUT TO FIT VIRTUALLY ANY FILTER. They work well in freshwater and saltwater aquariums and even ponds. Whatever filter you use, the carbon filter pad will work for you! Activated carbon, also known as activated charcoal, removes foul odors from aquarium and pond water LEAVING A CRISP CLEAN SMELL. The strong fibers of our charcoal fish tank filters can take a lot of punishment, even standing up to outdoor pond use. The fish tank carbon filter has no risk of ripping and spilling carbon in your tank. Made in the USA. Changing the aquarium carbon filter pad regularly WILL INCREASE WATER QUALITY by removing solid compounds before they break down. carbon pads for aquariums The activated carbon filter pad replaces loose carbon in your aquarium. Our charcoal filter pads perform the same duty as activated carbon granules without the mess of spilled carbon and carbon dust particles in your aquarium. Cut your aquarium carbon pad to fit your filter, rinse, and it is ready to go!