Penn Plax Undergravel Filter – Premium Aquarium 4 Filter Plate System Designed to Fit 40/50 Gallon Tanks</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Undergravel filter system includes 4 filter plates (each measuring 11.5" X 11.5") with extra large 1 inch adjustable lift tubes.</li><li>Filter is suitable for most 40 and 50 gallon aquariums. Clips to hold each section securely together are included.</li><li>2 carbon filter cartridges remove odors， and water discoloration by trapping the pollutants in the pores of the carbon.</li><li>This undergravel filter hides from view for maximum aesthetics. Safe for use in both freshwater and saltwater tanks.</li><li>Effortless setup and easy maintenance make this premium undergravel filter a must have for all home aquariums.  Simply place filter plates at the bottom of the tank and cover with gravel.</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/41kJiQjMz3L.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51sbr-j4pfL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/31mInfCgzFL.jpg' noproxy></br>