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Thanks for your response. The black algae is really a pain. I can only stand to do so much brushing. But as the weather cools off a little bit it will be more tolerable. I wish they made a robot with a steel algae scrubbing brush. I will look at adding more acid to reduce those parameters...

Phosphate reading comes from LR phosphate test. Other readings are from taylor kit. Calcium phosphate is a possible precipitate, right? So how can it not be involved? According to these calculations: What phosphate ppb will precipitate calcium phosphate? critical phosphate concentration...

My pool has been producing lots of white powdery/sandy precipitate this summer, at least a few cups a week. I guess it is probably calcium phosphate? I also have been battling moderate black algae on the bottom of the pool but the water is clear. Here are my numbers: SWG FC: 8 TC: 8 TA: 70...