My pool hasn't been taken care of for over a year, and is green. After reading the advice here, I started attacking it with bleach two weeks ago.
All of my chemical readings are fine and my CYA is close to or at zero, so I am maintaining a FC level of around 15ppm(my kit maxes at 10) I clean the filter almost every day, and the chlorine levels stay high overnight. I have been losing chlorine during the day, and it's starting to get expensive. I see improvement but it's very gradual. I can see about two feet through the water and it is only improving by a few inches per week.