Fluval Ammonia Remover is a natural ion-exchange media designed to remove toxic ammonia as water passes over it. Controlling ammonia levels reduces stress on fish. Use this product to provide a healthy environment when setting up a new aquarium or maintaining one that contains a higher than average fish stock. For freshwater use only. For filter models: 105, 205, 305, 405, FX5, 104, 204, 304, 404, 103, 203, 303, 403
