EasyPro BBM1 Bio-Blox Filter Media for Ponds， 1-Cubic Feet Box</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Great low-cost solution for large volume applications</li><li>Approximately 500 square feet of surface area in every cubic foot of material</li><li>Long-lasting polyester media provides additional mechanical filtration to trap particles that compromise pond water clarity</li><li>More surface area means more beneficial bacteria to break down more toxic ammonia and nitrite</li><li>Use for large or small applications</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/41WgdLIaUeL.jpg' noproxy></br>