There is only one way to do that, and it is to jettison water and top up with fresh water weakening the mixture of water and salt. If you are going to do this calculate how much too strong the salt...
The Australian Standard for pool water is 7.0 to 7.8, with 7.4 being ideal.
It may be uncomfortable to your skin.
The Chlorine generator is what causes the high PH and its not a Salt Water Pool
Add a mild acid and/or water, depending on what's being neutralized.