Powerful and convenient internal filters for mechanical, biological and chemical filtering - now even more effective. All interior filters now have two filter chambers 1 filter sponge can always remain in the filter chamber when cleaning - minimising the loss of useful bacteria. The main body of filter remains in the aquarium while filter sponges and the impeller are removed for cleaning. Flow adjuster allows regulation of flow rate. Outlet nozzle can be rotated 180 degrees. Controllable Venturi system provides additional oxygen supply by blowing air bubbles into the tank. Simple to fix in place with adhesives suckers. TUV/GS tested, CE certified - safety and reliability assured. 2 year guarantee. Biological filter sponge and active charcoal filter available as spare parts. This range has 4 different models:- IN 400 Plus suitable for aquariums up to 60 Litres IN 600 Plus suitable for aquariums up to 100 Litres IN 800 Plus suitable for aquariums up to 150 Litres IN 1000 Plus suitable for aquariums up to 200 Litres Please not epackaging may vary between models.