Our pool was built 15 yrs ago with coping from a local limestone quarry and a salt water system. Within 1 year our coping started deteriorating. Basically it was pitting and flaking away. It took the builder a while to determine that it was the salt water system. Their solution was to replace the coping and seal it. However, within another year it started happening again! So they gave up and replaced the coping again and switched our pool to a standard in-line chlorine feeder. (Supposedly they could not switch us to a stone coping because of the thickness.) Since then we have not had any issues. They thought that since limestone is porous the salt water was seeping into the stone and once the water evaporated the salt would crystallize causing the stone to slowly break apart. I don’t know if that is what was happening but it appeared that the salt was the issue. Thirteen years later and we are still good. Maybe some limestone is more dense and it wouldn't have been an issue but I wanted to share our story of what we experienced. We were lucky that the builder honored their warranty and took care of it but it was a real pain. Here is a link to a picture of one of the pieces. Limestone piece
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