5 Steps to Fix a Pool After Heavy Rain

Test the water Heavy rain dilutes chlorine, adds organic debris, and shifts pH. Test chlorine, pH, and alkalinity before adding anything.

Shock the pool Add a heavy dose of calcium hypochlorite or liquid chlorine. This kills algae and breaks down contaminants.

Brush and run the pump Brush the walls and floor to loosen settled debris. Run the pump 24/7 until the water clears.

Balance the chemistry Once cloudiness drops, adjust pH and alkalinity back to normal levels. Do not add algaecide—proper shock is usually enough.

Wait a day A day of shock and filtration typically restores clear, swimmable water. Overcomplicating with extra chemicals is unnecessary.