'S-90 Algaecide' is an algaecide. Its Federal EPA registration number is: 3432-52. It was originally approved by EPA on 13 Apr 1982. Its registration got cancelled on 15 Apr 1994. It has a 'Caution' signal word. It has the following active ingredients: Simazine. It's approved for 1 sites including swimming pool water. It is also approved for 2 pests and pest groups including but not limited to black algae and green algae.