I have an above ground pool. Keeping the wedding cake type steps from floating is always tough. The directions say to put sand bags on the inside of the steps but it isn’t that easy to do. It makes moving them to clean and scrub the walls difficult. I was thinking about taking a piece of flat river rock and placing it on the bottom step. It definitely has the weight and is nice and smooth, I am not worried about somebody getting hurt with it. Is there any downside to placing in the water chemistry wise?