Black spots

Yelimex

Active member
Jan 9, 2021
27
Austin, TX
Pool Size
16000
Surface
Plaster
Chlorine
Liquid Chlorine
A few days ago I started spotting a few of these black dots, mostly on the steps. I was able to scrape one with my finger but when I tried to use the brush, it did not remove them. Any advice?
 

Attachments

  • 5E4773F3-602A-4157-AEFB-95E023DFA2E0.jpeg
    5E4773F3-602A-4157-AEFB-95E023DFA2E0.jpeg
    569.5 KB · Views: 19
Scrape one off and smear on a piece of white paper. If it smears green, it is black algae.
 
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.