OASE BIOSTYLE THERMOCompact Power Filter with integrated heater For large filter capacity Compact, sleek power filter Ideal for fresh or marine aquariums Multi stage filtration Includes one complete cartridge that houses a 45 ppi foam for mechanical and biological filtration, a chemical mix to remove odors, impurities, and harmful nutrients, and finishes with a filter fleece for a water polishing effect Biological filter foam Also includes one 30 ppi biological filter