I was terrified when we built our pool as we used Oklahoma Flagstone for the coping and spa and fire pit, and decided to go with a Salt Water Chlorine Generator. Have been thrilled with that choice, hardly any maintenance. This was the sealer I put on before introduced to salt water a year and a half ago, and I reapplied today. I told everyone that I would keep everyone informed about the status of my natural stone and the salt water.
I am happy to report that there has been no degradation of my stone yet. We are right at 17 months. Still probably to early to tell, but I am happy so far.