Okay, we are the crazy people who are restoring an old in ground pool. We thought we were done but....we are losing water somewhere. Before you ask, we had the plumbing pressure tested, I have tried shutting off 1 feature each night and we still lose water. So I went to the skimmer. We have a two hole bottom. One is closed, it just lets out to the underground. One heads to the pump. Next to both of these holes are two small circular holes, about 1/8-1/16 in diameter. I stuck a toothpick in these and they go in anywhere from 1/2-3/4 inch. Could these be the culprit? Do I need to plug them? How should I plug them? I attached some before and after for you...