I'm looking to put in a new pool and different builders are saying different things about SWG pools and whether or not they will damage natural stone coping/decking. I'm looking at Tennessee Crab Orchard or Norwiegan Buff for the stonework and would like to also have the stone laid underwater in the benches and sun shelf.. Some say that the SWG will damage the stone and are asking me to sign a waiver and others are saying that SWG pool water is like sweat or tears and it won't damage the stone. What's the real truth? Thanks!