iSpring FA15 10-in inline 2-Layer Alkaline Replacement Filter Cartridge with Calcite & Mineral balls</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Includes Mineral Stone and Calcite</li><li>Improves the taste of RO water by adding minerals</li><li>Raises pH by 0.5- 0.8</li><li>Can be added to any undersink water filter or RO system</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/31vF291g4rL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51tCeyQIBEL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/61W9gPIzGcL.jpg' noproxy></br>