I'm feeling a bit exhausted after my 1st SLAM to recover a 2 year neglected pool about 1 month ago. It was my fault as I was recovering from a medical issue and just let it go. The pool looked good after I followed the great advice on here. There were some stains at the deep end which looked like leaf/muck stains as they would not brush off even with a SS brush. OK, I can live with that as I can still enjoy my pool. There were some iron stains which I removed with an AA treatment more than 2 weeks ago. Thanks again to TFP. Now I am having a black algae problem. I tested it by scraping it off with my fingernail and spreading it onto a white paper, it was dark green . I have been keeping the FC at 5ppm since the SLAM. I also added PQ 60 before hand, bringing up the FC slowly after the AA treatment.
So here we go again. I'm ready to SLAM again if it's not a lost cause. Here are my numbers:
Photo of suspected black algae
My pool today after overnight SLAM. Pool was perfectly clear before start of slam.