I had an algae outbreak of which most of it I cleaned(from the bottom of pool with vacuum brush). I shocked the pool and its been at around FC of 12 with no CC's. Can I close the pool like this ? Or do I have to get every speck of green out---its hard to see once you start vaccumming. The pool looks relatively clear. I did not bother checking other levels besides PH. No one is swimming at this point.

This is one of those............"you can pay me now, or you can pay me later deals." Based on what you've said, you KNOW you have it. Will it grow much over the winter....probably not. But it will be much easier to cure it now while you have it on the run rather than next spring. The OCLT test is your friend.

As woodyp says, you can go either way. I'd just go ahead and close, assuming you are done swimming for the season anyway. But that is just me.