Green pool recovery

Shock to 40% of CYA and hold it until the water passes the overnight chlorine loss test.

  1. Remove debris, run the pump 24/7, clean the filter.
  2. Test CYA. If it is very high (above about 80–100), partly drain first; otherwise the shock level becomes unreachable.
  3. Raise FC to 40% of CYA[6] and hold it there: test and re-dose several times a day, brush daily.
  4. Done when CC is 0.5 or less, the water is clear, and FC drops less than 1 ppm overnight.

Lower pH toward 7.2–7.4 during the shock; chlorine works faster at lower pH.

General information, not a substitute for the product label or a licensed professional.