I think I have black agae?

[th3impaler]

I have been having these small black spots appear and it has been impossible to scrub them out, even with a stainless steel scrubber.
Can anyone help with guidance of what to do?

Thanks!

 

[Bperry]

I have been having these small black spots appear and it has been impossible to scrub them out, even with a stainless steel scrubber.
Can anyone help with guidance of what to do?

Thanks!

Welcome! Probably regular algae, depending on what your chlorine and CYA levels are. How are you testing the water?

 

[th3impaler]

when these appeared they were low as I had a baby and didn't take care of it. now i am at over 10ppm free and available chlorine and 50 ppm CYA now

 

[Bperry]

when these appeared they were low as I had a baby and didn't take care of it. now i am at over 10ppm free and available chlorine and 50 ppm CYA now

You may need to follow the SLAM process using a Taylor test kit. Do you have one?

See this:

SLAM - Shock Level and Maintain

We’ve all had to deal with a green pool. Clear algae from your pool with a SLAM! Read here to use shock level and maintain to clear your pool.

www.troublefreepool.com

 

[th3impaler]

I have a testing kit. I did the overnight test. I dropped .8 PPM of chlorine. But my CYA / PH level dropped a bit so I am guessing my pool filled up a little with the sun. Does this point to it Not being algae? My CC is at 0.
I can't seem to get these black spots off even with a stainless steel brush and they kind look like they are holding on for life on the side of the pool.
I have not gotten into the pool to get a closer look but I will heat the pool this week and jump in and see what it looks like up close.

 

[Rancho Cost-a-Lotta]

Black algae is actually dark green. If it is black algae, you should be able to scrape some up with your fingernail. Wipe it on a piece of white paper. If it streaks green, you confirmed the presence of BA.

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

 

[th3impaler]

Here are some more photos, i can't really get in to scrape it quite yet.

 

[Rancho Cost-a-Lotta]

The photos aren't very helpful. Rule out BA first, then move on. The water can't be that cold. Do you have trees dropping stuff in the pool? Tannin staining is another possibility. Rust, another possibility. Are there comet trails on the circles that lead toward deeper water? More info here.

Stains in Your Pool

The stained pool is beyond embarrassing. Our in-depth Guide to remove stains in your pool will help you to remove the stains and prevent them in the future.

www.troublefreepool.com