Okay I have been browsing the pool school and some of the different topics in the just getting started forum. I have been taking care of my pool for a year now. In the past I had used the "test Strips". In the past few weeks I noticed some darker patterns on the floor of my pool. This has prompted me to do more research and get my pool into shape. I am assuming that the dark areas are black algae in the crevices of the pebble tec. Currently I use 3" stabalized chlorine tabs...mistake i think...The current test numbers that I have are
After utilizing the calculator It appears that I need to replace some water. Once i have replaced the water I need to re-test.
The pool is crystal clear with no off odor.
I did shock 2 days ago with Aqua Chem (active ingredient Sodium dichloro-s-triazinetrione) From Costco
My main question is where do i start? Drain the pool by half?