We want to paint our in-ground, gunite swimming pool and when we emptied the pool there are two 2" plugs and a grate covering another hole in the middle of these two plugs. We have no idea what this is. We released the two plugs and ground water came up out of them. Again, the middle hole is just that, a hole with a metal T bar inside of it. We don't want to pull on it in fear we will break something. If you know what this is, please let me know. Now, here's the problem. How can we paint our pool if ground water keeps seeping up from these two 2 inch holes? Will it be safe to plug these two holes back up for about 4 days until we are done painting? I'm afraid our pool will come out of the ground. Please help.