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.