I am a newbie to this site and a newbie pool owner (16x32 AG). I had a problem with the sand bags in the plastic zip lock bags because they kept breaking and it created a big mess with sand everywhere. So I placed large heavy rock (thich flagstone's that I had at home) in a plastic storage type tote with lid. I threw in a few Chlorine tablets and poked some small holes in the lid then I taped the lid with duct tape. It's at least 100 lbs and seems too be working. Are there any possible drawbacks to my idea?