'Krystal Klear' is an algaecide and disinfectant. Its Federal EPA registration number is: 34164-9257. It was originally approved by EPA on 01 Jan 1976. Its registration got cancelled on 29 Sep 1988. It has a 'Caution' signal word. It has the following active ingredients: Trichloro-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.