4 Reasons to Shock Your Pool After Heavy Rain

Rain introduces contaminants Heavy rain dumps debris, dirt, and algae spores into your pool while diluting chlorine, creating conditions for algae growth.

Shock immediately after rain stops As soon as the water is calm and there is no lightning, add non-stabilized shock to reach breakpoint chlorine levels—usually 10-15 ppm.

Run the pump continuously Keep the pump running 24/7 until the water clears, then check and adjust pH and alkalinity, as rain tends to lower pH.

Prevention beats cleanup Keeping chlorine levels up before a storm helps, but shocking after rain is the key difference between clear water and a swamp.