I am considering using the same travertine slabs as my coping for the swim shelf and entry step treads in my pool. I have seen pics on Pinterest of it being used for entry steps and shelves. Info online is mixed. Some say yes it’s okay some say no it won’t hold up. I am not in a climate where freeze thaw is an issue and plan to do salt system. Other pool interior surfaces will be glass tile. Does anyone have first hand experience on this?