I have finally got my readings in the goals set by pool math. I am using 8% bleach. My current readings are:
I still get a brown/ black buildup in the center of the pool. It seems like its debris rather than algae. Doing an overnight test tonight to make sure there is no organically present. Is this normal? Property is surrounded by pine, oak, maple, evergreens and dogwoods and two crepe myrtle bushes.
My thanks to TFPC and my new TF100 kit for putting me on the right track. My pool is crystal clear.