Flagstone coping around swimming pool
When we built our pool 2 years ago we decided to use flagstone for the coping that goes approx 2 inches into the water. We have a salt water pool system.
As expected and explained by our pool contractor the flagstone would flake for a period of time. The contractor came out and spray sealed the stone after about eight months of installation which didn't seem to do anything.
Two years later the flagstone is flaking worse than in the beginning to the point of deteriating below the grout lines.
Some of the stone can be rubbed off by hand into a redish sand. Needless to say I am concerend and would appreciate your advice.