North Star NSAS 4510 Replacement Cartridge for NSAS 4500<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Inhibits scale (mineral) buildup - Extends plumbing life</li><li>Compact installation - Easy to maintain</li><li>Eco-friendly - Clean and easy-to-use</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31Du6zqELpL.jpg" noproxy>