Key Features Compact External Filters For Tanks up to 300 Litres Automated shut off to prevent water loss when cleaning Complete set up-includes media, hose, adaptor, flow intake and outflow tubes and water diffuser Helps to produce Crystal Clear water through a multi-stage mechanical and biological filtration FiltoSmart External Aquarium Filters, new systems direct from Oase. The FiltoSmart External Aquarium Filters are small and compact filters designed for the smaller to medium sized tanks while creating essential space saving solutions. They help to create crystal clear and healthy water through multi-stage mechanical and biological filtration along with a large filter surface area in a small compact filter unit. On top of working hard to keep the water clean by using the multi-stage filtration system, the 100 -300 range of FiltoSmart’s also offer a selection of added benefits making them ideal for larger tanks. Such as: Automated shut off feature that prevents undesired water