Living Pets Filter Carbon provides excellent chemical filtration by removing impurities from your water. Large pellet shape is particularly convenient for use in media baskets. Usable in most filters; including power filters ; canister filters ; and wet/dry filters & sumps ; this item will also remove odors; medications ; and discoloration from your water. Prewashed to remove dust; the Filter Carbon is safe for use in both fresh and salt water aquariums. For more information on chemical filtration; please see our article on Aquarium Filter Maintenance .