'Guardex Pool Chlorine Concentrate' is an algaecide and disinfectant. Its Federal EPA registration number is: 1729-139. It was originally approved by EPA on 02 Jun 1986. Its registration got cancelled on 01 Aug 1987. It has a 'Danger' signal word. It has the following active ingredients: Sodium dichloro-s-triazinetrione. 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 algae and black algae.