I have a pool under construction and the rock guys are going to have to come back to replace some rocks in my coping and water feature wall because I found saw cuts in them. While I previously did not think it was a big deal, I now also now wonder if I should have several pieces replaced that are flaking and have a surface that appears rusty.
Previously I had assumed that once things were done they would power wash the stone to get all that off but after flaking some of it off by hand, it is rusty underneath as well. While it is a pretty color I don't want rust getting in the pool or on swimsuits/feet etc.
Can anyone speak to whether this is an issue with the rock or if it is just a matter of cleaning the rock? We have only 2 of them like this and the fact that the others don't look like this has me thinking more and more those stones need to be swapped out.
Is rust an issue for flagstone in general?