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  2. Chlorine
    • According to 2 sources
    Pool shock is a chemical treatment used to sanitize swimming pools and hot tubs. It typically comes in a powdered or granular form and contains a high concentration of chlorine, which helps kill bacteria and other harmful contaminants in the water.
    Pool shock is a concentrated dose of chlorine (or non-chlorine oxidizers), that is added to a swimming pool to rapidly increase the free chlorine from 2-4 ppm to 10-20 ppm. This level of superchlorination overwhelms pathogens like algae, bacteria, and other contaminants.
     
  3. Guide to Swimming Pool Shock Treatments | Pool Chemicals

     
  4. 5 Best Pool Shock Treatments to Clean Your Pool