5 Steps to Properly Shock a Pool After a Party

Raise free chlorine to 10–30 ppm The exact target depends on your stabilizer (cyanuric acid) level. After a party, contaminants like sweat, sunscreen, and urine consume chlorine and create chloramines, so you need a stronger dose than usual.

Test and adjust pH first Get pH between 7.2 and 7.4 before shocking. This makes the shock more effective at killing contaminants and breaking down chloramines.

Use a non-stabilized shock Choose calcium hypochlorite or lithium hypochlorite. Avoid stabilized shocks that add cyanuric acid, which can build up and reduce chlorine effectiveness over time.

Shock in the evening and run the pump overnight Sunlight burns off chlorine quickly, so add shock after dark. Keep the pump running all night to circulate and filter the water.

Wait until chlorine drops below 5 ppm before swimming Do not let anyone swim until free chlorine is under 5 ppm (or your local health code limit). This prevents skin and eye irritation.