Black water-level rings on the steps

Algae problems in swimming pool water.
Green (cloudy) water or slimy pool walls.
Black algae. Mustard algae. Pink or white pool mold.
deaun who can't sign in

Black water-level rings on the steps

Postby deaun who can't sign in » Sat 02 Jun, 2007 21:19

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]

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Postby Buggsw » Sat 02 Jun, 2007 21:41

Rub some vitamin c tablets on it and see if it improves. If it does, it's a metal stain. If it doesn't, try rubbing with a chlorine tablet, if it lightens, it's organic.

Other than that, I have no idea, unless it is rebar showing through.

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