At Marineland, innovation powers everything we do.From industry firsts to industry standards, Marineland products are designed with both performance and style in mind.We push precision and power beyond the expected and listen to our loyal customers to make our products even better.We do this because at the heart of our innovative spirit is a desire to help hobbyists everywhere do more, create more and, most of all, enjoy more.Make it Marineland.Marineland Chemical Filtration Premium Activated Carbon Bags fit all C Series and Magniflow Canister Filters.Remove more discoloration, odours and impurities from your aquarium with these carbon bags.For best results, change carbon every three weeks.Each bag contains Black Diamond Premium Activated Carbon inside.This pack contains 2 bags.Keep your aquarium water clean and clear with proper filtration.Look to the Marineland product line to provide a variety of products and solutions to keep your tank in peak condition.