I need to get some pictures up here, but we are mid pool build and had the brilliant idea of cutting out a cotton boll and placing it at the bottom of the pool between the main drains. (we're in the middle of the largest cotton patch in the world). Initially we thought of cutting it out of porcelain tile and then we had the idea to cut it out of marble instead. We like the marble better, but it occurs to me that marble isn't the hardest stone out there and I wonder if there will be any problems with marble submerged at the bottom of my pool. Anyone have any experience with submerged marble?