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hello I'm trying to figure out what to do about these black dots. they are only in one area of the pool by the ladder. they showed up randomly last week. they do not brush off. I tried using the hth stain protector and treating for algae. I also shocked the pool. it has not changed at all. I do...

Hey all. Having a terrible problem with 0 total and 0 free chlorine on test strip kit and also reagent kit. Other levels all normal range: pH 7.4, cya 40, total alkalinity 120. 42k gallon in ground granite pool. It all started with a green algae bloom approx 1 month ago. That resolved with a...