Crystal Blue Copper Sulfate Algaecide - Aquatic Grade Granular Pond Algae Control - 5 lbs<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>99% Copper Sulfate Pentahydrate</li><li>Controls most species of algae like filamentous， string algae and swimmers itch</li><li>Most effective when cast out on top of thick floating algae mats</li><li>Granular Copper Sulfate， 5 Lbs</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51iyQpkgOgL.jpg" noproxy>