I have a 25x15 AGP in eastern PA. Every winter, I put a 15x4 air pillow secured in the center, put the cover over it (draped loosely over the pillow, laying on the water before going over the pool side). Each year before closing I drain it about 6-8" so it's just below the skimmer level. Both skimmer and return line port are sealed off.
Each year around early February (imagine that, NOW) my water level mysteriously drops about 2ft and I end up having to put a garden hose in and raising it back up so the cover with snow and ice isn't hanging so low on the water level it's pulling hard on the side walls. WHERE IS MY WATER GOING?? It's been frozen for well over a month, so I don't think snow and ice pressure is pushing it out. It doesn't happen before late January of each year, and I do not have any leaks throughout the summer, I only add water a couple times a summer as it gets a little low on the skimmer.
Any ideas what is going on?? I can't believe the weight of the ice/snow is doing it, I am so confused.