I am not talking about the vinyl-lined kind with sand underneath the liner. I have an ordinary in-ground concrete pool in the back yard. The problem is it is too deep for babies. My sister had the same problem, plus her pool was cracked and needed repair. She opted to take out her pool.
Mine is in good shape, and I am not yet willing to take it out. Since the bottom drain apparently does not work, and has not worked for ages, I have the idea of partially filling the pool with sand -- a whole lot of sand -- until the water is about a foot deep. This will not block the water circulation as the working water inlet and outlets are both near the surface. I would have wanted to filled it completely with sand to make it a big sand box, but I think I need the layer of water there to deter cats. As the babies grow up, I will scoop out some sand and make the pool deeper.
A google search reveals that sand bottom pools do exist, but they are most often found in resorts and parks. My question is does this kind of thing exists in people's back yard? Will it be a problem to keep clean and sanitary?