Nuvo H2O S-2416 Studio Water Softener Replacement Cartridge<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Studio cartridge</li><li>Treats water for about 3 months</li><li>The cartridge contains a proprietary， FDA-approved formulation</li></ul></div><img src="http://ecx.images-amazon.com/images/I/210Ke%2BDYHXL.jpg" noproxy>