Thanks! Here is the ingredient list of the 4/1 product:
Pool Time Chlorinating Granules PLUS - Sanatizer plus Shock

Trichloro-s-triazinetrione 87-90-1 71.8 %
Boron salt 5 - 10 %
Trade secret 001 5 - 10 %
Trade secret 099 10 - 15 %
Formulated with sunlight-protected chlorine, special clarifier, filter enhancer and algae inhibitor
Helps kill bacteria and algae
Helps destroy swimmer contaminants
Helps clear cloudy water
Convenient skimmer application