99% Trichloro-S-Triazinetrione VS 95% Trichloro-S-Triazinetrione and 5% other

New pool owner here. Previous owners used "99%" Trichloro-S-Triazinetrione 3" tabs. Needed more and found Clorox Xtra Blue 3" Chlorine tabs which is "95%" Trichloro-S-Triazinetrione and 5% other stuff. It doesn't say what the "other stuff" is though. Is this OK or am I better off using one that is 99%? Supposedly the other "stuff" helps keep the pool blue and clean scum, but I am concerned about what chemicals they might be using. Thoughts? Thanks!