I hope it was an old liner! Otherwise it may be a few shades lighter in the spring. Personally, that's why I don't bother with pool companies. As for the closing, unless they hauled away all your stuff, and put on the cover, why pay THEM to dump in the wrong amounts of chemicals?

If you MUST drop you FC levels, there are things you can do, but you should be OK as is.

Your FC really shouldn't be higher than 25-30 and you didn't say what pH is (Higher pH inhibits chlorine's action). But Chem_Geek is almost certainly correct that your pH went up.

For now, don't worry. Water temps below 60 inhibit algae growth, the chlorine will dissipate over the winter and your CYA may well drop to more reasonable levels.

Next season, look at our fall closing threads and save yourself a bundle, not to mention heartache.