Hi, I'm a newbie here and I have a problem. I have an inground 22,500 gal rectangle, vinyl liner, with a sport bottom. I just realized a small leak and now it's time to close the pool. I do not know where the leak is. The leak rate is about 1/2 inch per day. I always close by partially draining, covering, etc., but with this leak, I'm afraid that my water will drain out before the hard winter months and my pipes will not be below the freeze line. I've winterized fine for the last 13 years, but I've not had a leak before. Is anti-freeze the answer here, or do I have more of a problem than that? Thanks in advance for your sage advice.