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Many saltwater pools have a chlorine generator, feeder, or chlorinator that releases free chlorine into the water. Locate the control panel box and turn down the dial 1 level. Retest your water the following day and further adjust the dial or turn off the machine, if necessary. If you turn off the machine, be sure to test the water 2-3 times per day, and turn the machine back on when the chlorine drops below 3.0 ppm. You may have chlorine tablets or a chlorine floater in the pool. If so, remove these items immediately so they stop increasing the amount of chlorine in the water. Don’t replace these items until the chlorine level has dropped below 3.0 ppm. Sunlight is incredibly effective at reducing the amount of chlorine in a pool! The UV rays break down the chlorine and allow it to evaporate. Simply leave your pool uncovered and exposed to direct sunlight. With no cyanuric acid (CYA) in the pool up to 90% of the chlorine can evaporate in as little as 2 hours on a hot, sunny day, so be sure the level doesn’t drop below 1.0 ppm. Purchase a chemical that neutralizes chlorine, like sodium sulfite or sodium thiosulfate. Follow the instructions on the package for use. Typically, you’ll add a dose to the skimmers with the filter running, and the chemicals will quickly lower the amount of chlorine in the water. You should be able to find these chemicals at pool supply stores and online. If the chlorine levels are really high, you can simply swap out some of the existing water for freshwater. Siphon 25% of the water out of the pool, then add freshwater to it. To siphon out the water:  Submerge a tube in the pool and allow it to completely fill up with water. Plug 1 end of the tube and transfer it to an empty container at a lower elevation than the pool. Unplug the end of the tube and allow it to drain into the container. Pull the tube out of the pool when you’ve siphoned enough water.

Summary:
Lower the output from the chlorine generator or feeder if you have one. Remove all chlorine additives from the pool, if applicable. Allow sunlight to break down the chlorine if the weather permits. Add a chlorine-neutralizing chemical to the pool for a quick fix. Replace 25% of the saltwater with freshwater if the levels are very high.