Thanks, chem_geek. I read the fall closing sticky thread and it said to maintain FC all winter. The author mentioned checking the chlorine periodically throughout the winter and adding it as necessary, but as you mentioned, I couldn't see how that is possible if my pool is frozen solid. I see now that I can just raise it to a high level to last the winter. I do have an opaque auto cover, so that will help prevent FC loss.

However, I also saw mentioned that FC should not be too high, or it might damage my cover, since it will not vent excess chlorine fumes well. I'm guessing a level in the 15 ppm range might be a good medium upon shutting the pump down, say when the water temp is about 40-45.

I did see PolyQuat mentioned as well, so I may give that a try. With your advice, I'm hopeful my situation will be much better next spring. Thanks again.