Our pool is over 50 years old, and has this wrought iron railing around it. We recently had to take down a huge, hundred-year-old oak tree, and in the process one of the rails was knocked over. We had contemplated removing them anyway, so that's what were doing. My question is this: With what should I fill the anchor holes to avoid problems like water collecting in the holes and freezing in the winter? My photos are apparently too large to attach, but hopefully that's enough information. Thanks in advance for any advice.