Q.Killed Most Of My Plants With Sandy Water That Had Salt In it.
My garden was watered with sandy water but found that it also had salt in it; what if anything can I do to the soil, as it has killed a few of my plants.

Certified GKH Gardening Expert
Chelating the soil can be done, but it not carefully, it can lead to more problems.
Citric acid is a common chelator. Using this at .02 percent along with dextrose at about .04 percent per gallon can help reduce salt concentration, but proper soil drainage will, ultimately dictate your success here.
Here is an article that will help you with the salt content of soil, and removing it:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/reversing-soil-salinity.htm