The Hagen A1389 kit can be used in the following applications:
The Fluval Edge Foam & Biomax Renewal Kit - A1389 helps keep your aquarium clean and maintains a healthy environment for your fish. This replacement aquarium filter includes one foam block for trapping particles and one Biomax that provides optimal colonization of beneficial bacteria. This aquarium Biomax filter reduces fish wastes and should be replaced every 2 to 3 months.
Fluval Edge Foam & Biomax Renewal Kit - A1389 specifications: