Is this Black Algae?

kristenthegiant

New member
Apr 12, 2020
2
Florida
Pool Size
18000
Surface
Plaster
Chlorine
Liquid Chlorine
This is my first post, and I can’t tell you how thankful I am for this community. We had some algae and started a slam. Usually, the slam clears everything up, but there are some stubborn black stains. I think it might be black algae and have been brushing it a few times a day with a steel brush while maintaining shock levels with liquid chlorine. Here’s a side-by-side picture taken on Day 2 (left) and Day 4/today (right). It looks like there has been some improvement, but I reaching out for feedback to make sure I am doing the right thing here. Do you think we are on track?
 

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ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
26,269
Northern NJ
Pool Size
35000
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Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Welcome to TFP.

Gently scrape a sample of the suspected black algae with your fingernail and then smudge it on plain white paper. If the smudge scrapes off and is a greenish color, then it’s black algae.

 
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kristenthegiant

New member
Apr 12, 2020
2
Florida
Pool Size
18000
Surface
Plaster
Chlorine
Liquid Chlorine
Welcome to TFP.

Gently scrape a sample of the suspected black algae with your fingernail and then smudge it on plain white paper. If the smudge scrapes off and is a greenish color, then it’s black algae.

Thank you for the tip!
 
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