Algae or Iron

Bdrohr

New member
Oct 27, 2020
1
CHarlotte NC
I seem to have what is either Algae or some sort of stain. My free chlorine has been elevated for over a week and have brushed daily and it does not seem to be helping the stain. When I look closer under water, it has a brownish tint to it. Any advice? Picture below, although I know it is hard to see. TYA!
 

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mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
41,849
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Welcome to the forum!
Algae will brush away. To test for iron, put a handful of Vitamin C tablets in a thin sock and crush them up a bit. Then put the sock on the stains and hold it there for a few minutes. If iron, it will go away.
I suggest you read ABC's of Pool Water Chemistry.
 
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