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:
So I am guessing that the combination of high temp and high CH and Phosphates plus the SWG and sources of aeration is causing this precipitate. I think the precipitate is helping the algae grow and survive. Is my best option a drain and fill? Tap water is CH: 250 & Phosphate: 0.8.