What is the difference between chlorine shock and stabilised chlorine granules?

Chlorine shock and chlorine granules are both powdered forms of chlorine with some key differences. Chlorine shock is stronger, faster-reacting and unstabilised. Unstabilised means it does not contain any stabiliser (cyanuric acid) so burns off quicker in sunlight. Chlorine granules are better for everyday dosing but chlorine shock is a better problem solver.