5 Reasons Your Pool Is Still Cloudy After Shocking

pH is too high If your pH is above 7.8, chlorine becomes mostly ineffective. Test and adjust pH to 7.4–7.6 before shocking.

Calcium hardness is out of range High calcium hardness creates a milky haze that filtering alone cannot fix. Test and balance calcium levels first.

Dead algae particles are too small for your filter Sand filters often miss tiny dead algae. Run the filter 24/7 for a day or two to help particles clump and catch.

You are not backwashing or vacuuming Backwash when filter pressure rises. Vacuum any debris on the pool floor to remove physical contaminants.

You are using test strips instead of a reliable kit Test strips are inaccurate. Use a liquid test kit to get precise readings for pH, alkalinity, and calcium hardness.