It’s best practice in terms of safety and product performance to add chemicals to the pool when nobody is swimming.

For granular chlorine and Shock treatment products:

  • Enter the water once the free chlorine level is below 3 ppm.

For pool acid:

  • Allow water to circulate for at least 2 hours.
  • Measure the pH level and only enter the water once levels are between 7.2 and 7.6

For other pool maintenance chemicals (e.g. algaecides, water clarifiers, metal remover)

  • Allow water to circulate for at least 12 hours before entering the water.
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