Our pool laid dormat for three years and it was pretty bad, but instead of draining and refilling, we have attempted to clear it up. We have tried everything, including what you have stated here. Our PH, FC, etc are all great,but still it's green and we cannot see the bottom. We even tried "Filter Aid" and "Floc". Nothing even happened. Now the guys that test my water just told me to drain it and start all over. We have a well and have to have water trucked in which is about $350. I would really like to avoid that. Any suggestions?