Aquatop Aquarium Carbon Cartridge for PF40-UV Hang On UV Filter</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>For tanks with a capacity up to 40 gallons</li><li>Insert is filled with Aquatop's own high quality activated carbon</li><li>Outer layer is made of strong poly-fiber to perform mechanical filtration</li><li>Extremely easy to use and to install</li><li>Keep your water crystal clear</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/519KrxTQ6tL.jpg' noproxy></br>