Is it safe to use trichloro isocyanuric acid as a disinfectant in drinking water?

Yes. Registrations for use of the ACL® products in drinking water were approved by the U.S. EPA in July, 2001. The full text of the registered labels for registration numbers 935-40 (ACL 90 Disinfecting Tablets), 935-41 (ACL 60 Disinfecting Granules), 935-59 (ACL 90 Disinfecting Granules), and 935-42 (ACL 56 Disinfecting Granules) can be found at the EPA's website: http://oaspub.epa.gov/pestlabl/ppls.home OxyChem markets four products for potable water use: ACL 90 Disinfecting Tablets in 1" (14 gram) or 3" (200 gram) diameter sizes ACL 90 Disinfecting Granules ACL 60 Disinfecting Granules ACL 56 Disinfecting Granules OxyChem's brochure "ACL® Disinfecting Compositions for Potable Water" and sales specifications are available on our website. Contact ACL Technical Service (877-873-4767) for more information on package sizes, feeder recommendations, etc.