What is this darkening in the pool?

Thethreetheory77

Well-known member
Apr 8, 2020
65
Longwood, Florida
Can someone give me an idea of what this darkening is in the pool? They are dark streaks and big blotches on the bottom of the pool. Have no idea what they could be except maybe due to my calcium hardness at 200? I know I need to bring that up but I have no idea what is causing this.
 

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ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
25,667
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
How old is the plaster?

Could be mottling of the plaster.

Or could be metal staining.

 
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