This 1000 Litre per Hour Internal Aquarium Filter is designed for submersible use and can be used in Fresh or Saltwater Aquarium Tanks. The Filter comes complete with spray bar and venturi Aeration nozzle attachments included that can be used separately with both outlets having the feature of adding further aeration to your fish tank. Maintenance of this unit is as simple as removing the bottom filter and charcoal compartment and cleaning the included filter foam. With the bottom compartment removed you will also have easy access to the impeller for cleaning / maintenance purposes