Fluval AquaClear 70 Nylon Media Bags are fine-mesh, reusable filter bags ideal for holding loose filter media (such as carbon, resins, peat) in your aquarium filter. They allow excellent water flow while keeping media securely contained. Using these nylon bags makes custom filtration easy and prevents media particles from escaping, helping maintain water clarity. (Pack of 2 bags, suitable for AquaClear 70 or similar filters)