Marina Slim Filter Zeolite Plus Ceramic Cartridge</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Absorbs toxic ammonia and reduces fish stress</li><li>Contains Ceramitek， a highly porous ceramic biological filter medium</li><li>3-pack; Easy to replace</li><li>Fits the Marina S10， S15 and S20 Slim Filters</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/51Q1hJG4zhL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41peGvLTk3L.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/31atiCNXEEL.jpg' noproxy></br>