My pool ended up a nasty dark green over the winter again. I started a SLAM and the water has shown considerable improvement. It has become a very light green but seems to have gotten stuck and is not clearing further. I can just barely see the bottom of the pool. I'm still losing around .5 ppm of chlorine overnight. I have scooped out all the leaves I can get and I'm brushing the pool and backwashing the sand filter on a regular basis. I know I'm still getting stuff out of the pool because the water coming out when I backwash is dirty at first. I had lost all my CYA over the winter but managed to get it back up to 30 by using a few pouches of shock. Other than that I've been maintaining my shock level using bleach. I'm getting a little frustrated because it seems I have hit a wall in the SLAM process. The only thing I can think of that I've done wrong is that I forgot to get the PH level balanced before I started the SLAM. I don't think I can fool with it now because the high chlorine level will make the PH test inaccurate. Thoughts?