Grech CBG-800 5W UV Sterilizer Hang-On Back Filter， 20-50 gallon/211 GPH</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Adjustable 211gph Filter Flow Rate with Surface Skimmer to eliminate undesired surface films</li><li>Features a 5W UV Sterilizer. Helps eliminate algae and bacteria， keeping aquarium water crystal clear</li><li>Suitable Aquarium Tank Size: 20 to 50 Gallons</li><li>Dimension: 9 x 5 x 7in (229 x 127.5 x 179mm)</li><li>Biological and mechanical filtration. Box includes active carbon and bio media</li><li>Note: Give the impeller “flywheel” a little push to start as magnet sometime stuck to certain position when sitting in the box for a long period of time.</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/41iGsy%2BfbRL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41nLt0n%2BYuL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41mdbAiHMcL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41RJHu4k3OL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41XSBTfLNPL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41t8hai5S4L.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41Uz-Syh0jL.jpg' noproxy></br>