The OASE BioStyle Thermo is a compact power filter that is perfect for marine and freshwater aquariums. BioStyle Thermo contains two disposable, multi-stage filter cartridges and two 30 ppi biological filter foams for increased biological/mechanical efficiency. Each Multi-Stage Cartridge includes a filter foam, three chemical media mix and filter fleece. The filter foam traps debris and waste and also offers surface area for beneficial bacteria. The filter media mix contains carbon, zeolite and phosphate binder, that removes odors, impurities, and harmful nutrients from the water. The filter fleece traps extremely fine debris for a water polishing effect. To optimize your aquarium filtration OASE offers different filter media cartridges that you can easily add to the BioStyle based on your aquarium needs. This BioStyle Thermo filter reduces the amount of additional equipment seen in the aquarium by integrating the heater into the filter unit. BioStyle is designed for easy setup and maintenance, with an adjustable leveler for securing the filter onto the aquarium rim, a telescopic intake and an easy to see cleaning indicator that shows when it's time to change the filter cartridge. This hang on back filter's adjustable flow control allows you to change the intensity of water movement and oxygenation in your aquarium.