How to deal with Stone with Iron

markayash

Gold Supporter
Mar 21, 2016
2,521
Atlanta Ga
I am starting to think my Stone Coping is the source of my iron. Some of the stones even have a rust color. Plus I never had Iron issues until I had the brick coping replaced with the re plaster.
MY question is what can I do about it? Would a vitamin C wash help or is Iron just part of the stone?
Would or can you seal the stone?

Thanks in advance