Black Algae Spots?

aqua mango

New member
Jun 10, 2015
2
Waikoloa Hawaii
Moved from here.
I have these little black spots in my inground pool as well. They don't scrape off at all but have responded to getting smaller when I chalk them with a chlorine tab. not sure what they are either.
 
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Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Aloha from the mainland and welcome to TFP! :wave: Any chance you could post a pic or two of the spots? Could you also update your signature with all of your pool and equipment info as well please? We'll do what we can to help.