Leisure Time 45510 Control， Quart<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Add this product before adding Boost or Free</li><li>Prevents waterline residue and controls metallic stains and scale</li><li>For more than 25 years， Leisure Time has been the premier name in spa water care</li><li>Prevents waterline buildup</li><li>Removes stain and scale</li><li>Contain sequestering agent</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31kep8Z2OeL.jpg" noproxy>