U.S. EPA registered pesticide info
'On Guard Premium Pool Algaecide Granular Concentrate' is an algaecide. Its Federal EPA registration number is: 3432-28. It was originally approved by EPA on 11 Feb 1974. Its registration got cancelled on 06 Feb 2013. It has a 'Caution' signal word. It has the following active ingredients: Poly(oxy-1,2-ethanediyl(dimethylimino)-1,2-ethanediyl(dimethylimino)-1,2-ethanediyl dichloride). It's approved for 1 sites including swimming pool water. It is also approved for 4 pests and pest groups including but not limited to algae, black algae, green algae, and mustard yellow algae.