The OASE BioStyle 30 white is a compact power filter that is perfect for marine and freshwater aquariums. BioStyle 30 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. 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 ti