How to Fix Too Much Shock in a Swimming Pool

How to Fix Too Much Shock in a Swimming Pool

    Purchase a swimming pool chlorine water test kit that specifically measures for free chlorine in the pool. A pool with too much shock will have high levels of free chlorine. Follow the manufacturer's instructions to read the results of the test kit, since different kits vary.

    Evacuate the pool. No swimmers should be in the pool when you treat for too much chlorine.

    Turn on pool filtration pumps. Add one-half ounce of sodium thiosulfate granules per 1,000 gallons of swimming pool water directly into the center of the pool. Allow swimming pool water to circulate with the sodium thiosulfate granules in the water for about 30 minutes.

    Turn off pool filtration pumps and unplug from the electrical source. Test the swimming pool water for free chlorine levels. If levels are still too high, repeat Step 3.

    Remove pool filters when optimum free chlorine levels are reached. Replace with new pool filters.

    Plug back in and turn pool filtration pumps back on. Test chlorine levels weekly. Carefully measure and follow manufacturer's instructions when adding additional chlorine to the swimming pool to prevent future episodes of too much shock in swimming pool water.


  • Swimming pools should have a free chlorine level of around 2.0ppm for optimum PH levels. Sodium Thiosulfate is an instant chlorine neutralizer. Pools without chlorine odor are perfectly balanced without shock in the water or high chlorine levels.


  • Swimming water that causes burning eyes and noses, while smelling of chlorine, is actually the result of too much waste in the pool and too high a ratio of combined chlorine. Combined chlorine forms when waste is broken down in the water.

Things Needed

  • Chlorine pool test kits Sodium thiosulfate New pool filter

About the Author

Daniel Smith graduated from technical school in 1993 and has been writing since 2005. His has written numerous articles for the instructional website called eHow in areas including gardening, home improvement, celebrating special events and health-related topics.