hidden algea

I have a fiberglass pool with a Pentair Intellabrite 5G spa light. After a year or so of owning the pool I started to see some rust colored junk on the face plate of the light. I removed the light from niche to clean and unleashed a giant plume of algae. After lots of scrubbing on the pool...

Day 6 of SLAM and I can see the pool floor finally! Just finished 6th gal of Chlorine, keeping the SLAM level at 12, and water still cloudy but getting better every day. I think I could do better with the brushing?‍♀️ Question of the day: My ladder has NOT been in the pool at all through this...