4 Steps to Fix Your Pool After Heavy Rain

Test the water first Heavy rain dilutes chemicals and drops pH, leaving chlorine low and water cloudy. Check pH, alkalinity, and chlorine before adding anything.

Shock the pool Add a shock treatment like calcium hypochlorite or a non-chlorine shock to kill contaminants from runoff.

Raise the pH Rain is slightly acidic, so pH often needs to be raised after shocking. Use a pH increaser to bring it back to 7.4–7.6.

Adjust alkalinity if needed Low alkalinity makes pH unstable. Test and raise it to 80–120 ppm before balancing other chemicals.