6 Lbs Activated Carbon in 6 Media Bags for Aquarium Fish Pond Canister Filter Removes odor, colors, organic pollutants, toxic compounds, medications Fast working, long lasting , Keeps water crystal clear Phosphate free , Safe for freshwater and marine aquarium The active carbon is bagged with a mesh media bag. Media bags allow the precise placement of carbon and ensure granular media doesn't travel through pumps and pipes. AS WITH ALL CARBON, RINSE CARBON FINES BEFORE USE