big_al, here's a link to the MSDS (material safety data sheet) for this chemical. Keep in mind the MSDS relates to the concentrated form you buy in the bucket.

http://72.14.235.104/search?q=cache:EUAJu0RiNcMJ:www.bel-aqua.com/MSDS/OMNI/421351.pdf+trichloro+triazinetrione+msds&hl=en&ct=clnk&cd=6