OASE BioStyle is a sleek, compact power filter, ideal for marine and freshwater aquariums up to 20 gallons. The BioStyle 20 contains one disposable, multi-stage filter cartridge and a 30 ppi biological filter foam for increased biological and mechanical efficiency. The complete Multi-Stage Cartridge 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 polishing effect. The easy to see cleaning indicator shows when it is time to change the mess free, disposable multi- stage filter cartridge or clean the biological filter foam. The filter includes one additional Biological Filter Foam that traps debris and provides even more surface area for beneficial bacteria growth. To further customize your aquarium filtration, OASE offers additional chemical media cartridges that can be added based on your aquarium needs. BioStyle filters are designed for easy installation, with an adjustable leveler foot for securing the filter to different thicknesses of aquarium glass and with a telescopic intake for varying aquarium heights. The filter’s built-in adjustable flow control allows you to change the intensity of water movement in your aquarium and increase oxygenation, or input of oxygen at the surface. Designed with German engineering and manufactured in Italy, this quiet and energy efficient filter is backed by a 3-year warranty.