Aquaclear Activated Carbon Insert， 20-Gallon Aquariums， 3-Pack (3-Pack)</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Convenient 9 pack. (3) 3pks</li><li>Adsorbs odors， discoloration and impurities</li><li>Designed to fit the AquaClear 20 filter</li><li>Suitable for aquariums between 5 to 20 gallons</li><li>3-pack; Economical way to purchase inserts</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/51u%2BhmCC5aL.jpg' noproxy></br>