Yeah, okay...what causes these?
I don't have black algae. There is nothing black anywhere else at all in the entire pool. But there are these two black water-level rings on the steps (I have walk-in steps in an inground pool). I have scrubbed scrubbed scrubbed to no avail. The rings were there when I bought the house (POOL!) and have become neither worse nor better with time/effort. Clues? It doesn't come off. I am leary of using a wire bristled brush to scrape scrape scrape with. Suggestions?[/b]
Black water-level rings on the steps
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