3 Steps to Handle a Pool After Heavy Rain

Check and adjust pH first Rain tends to lower pH, so add soda ash or borax to bring it back to 7.4–7.6.

Shock the pool hard Rain can wash out stabilizer and kill chlorine residual. Double your normal shock dose to kill any algae or bacteria that blew in.

Skim debris and run the pump Remove leaves and junk from the surface, then let the pump run for a few hours. Skip testing alkalinity and calcium—they rarely change from one storm.