Introducing the compact BioStyle 115 Filter, part of the Oase Hang On Filter range. If a conventional external or internal filter doesn't suit your requirements, then a Hang On Filter may be just the thing, offering its very own advantages. In comparison to a standard external filter the BioStyle Hang On Filters require no messy hoses, or appropriate cabinet space for installation, Likewise Hang On Filters do not take up any space inside the aquarium offering a clear view of your underwater world unlike an internal aquarium filter. Available in 3 sizes to suit a range of aquarium sizes the Oase BioStyle multistage filters offer both biological and mechanical filtration. Additional features make filter maintenance a breeze, with easy removable filter cartridges and integral cleaning indicator which indicates when the cartridge requires cleaning or replacement. The integral adjustable spacer ensures the BioStyle hang-on filters fit perfectly onto the aquarium regardless of glass thickness for easy installation. Furthermore, the transparent intake pipe is telescopic, allowing for varying aquarium depths. The BioStyle also boasts an easy adjustable flow control and quiet operation thanks to durable construction all backed by a 3 year Oase warranty for peace of mind.