Blackish algae spots

[cjbyrd]

Hello, I've been out of town with my family for the last 6 months for my 2 year old son's bone marrow transplant. My father in law has been taking care of our pool as best he can. We just returned home a few days ago and I have blackish dots of algae in my pool and I was wondering what is the best way to get rid of it. While we were gone the chlorine generator died. I ordered a new one which my father in law insisted when it arrived. Im not sure how long it was out before I noticed it wasn't working. I just tested my water and everything is in balance except for cya, which was basically nonexistent around 10 ppm fc was at .6 ppm. Which im sure is due to not enough cya. Im about to add 2 gallons of liquid cya to get that back up. I also threw 2 bags of cal shock in the pool the other night which seemed to clear up some of the algae. I have attached pictures of the remaining algae after shocking the pool. Thank you in advance for the assistance

 

[FloridaGary]

If you have a Leslie’s Pool Store, get the Power Powder Plus shock and poor it directly on the algae spots. Go back later and brush it off. This happened to me once and that was recommended and it worked with a 1 lb bag of Power Powder Plus shock.

 

[cjbyrd]

Thank you, I do have a Leslie's. I will definitely check that out. Should I use a regular pool brush or should I get one of those attachments with the metal bristles?

 

[Rancho Cost-a-Lotta]

Before you do, let's confirm that it is black algae. See if you could scrape some off with your fingernail and wipe it on a white piece of paper or cardstock. If it smears green, it is black algae.

Black Algae

This guide provides a step by step procedure for eliminating black algae in your concrete or gunite pool. Read full post here.

www.troublefreepool.com

 

[FloridaGary]

Thank you, I do have a Leslie's. I will definitely check that out. Should I use a regular pool brush or should I get one of those attachments with the metal bristles?

If black algae, the metal bristles are preferred. The Black Algae guide that Rancho provided is a must read.