help, do I need to drain my pool??

We used to say that if your water was under 50, then you didn't really have to worry about algae, Until my co-moderator Al (Poconos) found some algae growing under ice in his pool in northeast PA! Where do you live and what are your winters like?

I would say you still need to keep the Cl levels at least at the minimum on the chart for your CYA level, but you'll find that with colder water it doesn't take adding chlorine nearly as often as it does with warm water to keep the levels up. If you shock the pool again now, you'll fnd that it stays a lot longer than it does in the summer :)