CerMedia MarinePure Random Shape Media in Mesh Bag for Koi and Goldfish Ponds， 1-Gallon</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Ceramic Bio-filter Media with Vast Surface Area AND Open-Flow Porosity</li><li>Ammonia and Nitrite Removal</li><li>Nitrate Reduction</li><li>Inert Ceramic</li><li>For Koi and Goldfish ponds</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/51C6bh0zmYL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/31ZOzMlDHqL.jpg' noproxy></br>