Spa Essentials 28304000 Stain and Scale Control for Spas and Hot Tubs， 1-Pint<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Prevents stains from dissolved metals including iron， copper and manganese</li><li>Prevents scale formation from excess calcium in water</li><li>Liquid formula</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41KbhECl5TL.jpg" noproxy>