Is this algae?

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
37,186
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Welcome to the forum!
Scrape off some of it and smear on a paper towel. Let us know what it looks like.
I suggest you read ABC's of Pool Water Chemistry.
 
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