'Formula No. 31' is an algaecide and fungicide. Its Federal EPA registration number is: 8540-4. It was originally approved by EPA on 10 Nov 1965. Its registration got cancelled on 01 Jul 1987. It has a 'Danger' signal word. It has the following active ingredients: 2-Mercaptobenzothiazole, sodium salt and Sodium dimethyldithiocarbamate. It's approved for 1 sites including cooling tower water. It is also approved for 2 pests and pest groups including but not limited to algae and slime-forming bacteria.