My brother's pool has a high level of calcium. I told him he has to drain his pool, but he said that he needed to know whether there is water underneath the pool since it will cause the pool to push out of the ground. Do you know where he would find that information? He's looked online and even called the local water people, but to no avail. Thanks! He lives in LA, specifically in the Westlake, Agoura Hills, area.