6 Lbs Activated Carbon Charcoal in 6 Media Bags Aquarium Fish Tank Pond Canister Pellets Air Filter Removes odor, colors, organic pollutants , Removes 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. The zipper-design media bag is reusable., Size of filter media bag: 8 " x 5.5 " AS WITH ALL CARBON, RINSE CARBON FINES BEFORE USE