You might want to search the forum on the flagstone statement. That is an excuse for poor quality flagstone. The salinity in a SWCG pool is not much more than any chlorine pool. If the flagstone will flake, it will under any environmental condition.I hadn’t planned on swg but after joining the forum, and fairly late in the construction process, I asked my PB about one. They said they do not like the idea because it will literally “eat my flagstone coping” not in the budget now anyway but I might add one later.