'Puritan #5577' is an algaecide. Its Federal EPA registration number is: 541-241. It was originally approved by EPA on 22 Jan 1973. Its registration got cancelled on 10 Oct 1989. It has a 'Danger' signal word. It has the following active ingredients: Alkyl* dimethyl benzyl ammonium chloride *(60%C14, 30%C16, 5%C18, 5%C12) and Alkyl* dimethyl ethylbenzyl ammonium chloride *(68%C12, 32%C14). It's approved for 1 sites including cooling tower water. It is also approved for 1 pests and pest groups including but not limited to algae.