Is This Black Algae?by Roohollah
Moreover, it is going to spread out some other our in ground concrete pool. Therefore, we are writing to get help from you that how we should remove this stubborn algae? Apart from that, we thank you for providing an extremely beneficial web site for us to learn more. I am looking forward to receiving your response Yours Faithfully, Roohollah Thank you for the question and compliment First you need to determine if it is black algae (organic) or some kind of staining (metals). This is very easy to do. Get a chlorine tab and put it in a sock. Put the sock directly on a black spot in the pool for about 15 - 20 minutes. Use a telescopic pole to hold it in place. If the stain fades, it's black algae. You can go to these links on how to get rid of black algae: Black Algae Is There Ever An End To The Black Algae Saga???? That Damn Black Algae Basically you'll need to shock the pool and scrub the spots with a wire brush. Black algae attaches itself to the plaster in layers. This is why it's one of the hardest to remove. It can be done, I've personally done it, but it can be a pain. If it doesn't fade, get ascorbic acid (crushed up Vitamin C) and put about 1/2 lb. in a sock and put that on the spot for 15 - 20 minutes. If that fades it's a metal/mineral staining problem and can be solved with an ascorbic acid treatment. This page has the ascorbic acid treatment: Brown Algae Won't Come Off Of A Vinyl Liner I'd like to have your complete chemical readings: Chlorine, CYA (cyanuric acid/stabilizer), pH, Alkalinity, Calcium Hardness, and Metals (iron and copper). It makes troubleshooting much easier and the process of clearing up your pool will go much faster. You can get this done at your local pool store. It might be something else entirely and the readings might give a clue as to what it is. It might not be algae, but something else. Hope this helps and have a great Summer. Robert
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