Black Algae or Pool Mottling

[hgiljr]

Hello all. Am I having black algae or pool mottling? This just appeared and also present in a corner wall where it curves from wall to floor. Thank you

 

[YippeeSkippy]

It looks like algae, but I don't think its black algae? How do you chlorinate your pool?
Can you share a set of full test results -
FC
CC
pH
TA
CH
CYA
Salt if applicable

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

Perform the Overnight FC Loss Test (OCLT)

The Overnight Chlorine Loss Test tells if the SLAM is finished or if you need to start a SLAM. This article says how to do the OCLT.

www.troublefreepool.com

Maddie

 

[hgiljr]

I use SW chlorination. I just came back from the pool store and results were all within range, only missing half a bag of salt water. I didn't write down the numbers though.

 

[YippeeSkippy]

Ah, well as long time reader/poster to TFP you know we don't abide by pool store tests. Do you need to order your own kit for use?
I recommend the TF-100 from www.tftestkits.net or the Taylor K-2006C found online usually.

Holler if you have questions-

Maddie