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There are many able and willing folks here to help you with all your pool questions :D
btw, do you know Lash? :mrgreen:
Re: Black (I think?) Algae that will not go away - any help appreciated!
It does not sound like black algae, if you can brush it away......
Some/most of it looks organic to me.
Have you tested for copper?
How does the pool look now? Do you have/can you take a pic of it just after...
Go to "settings" (top R under Pool School button), then select "general settings" (left side). I think that is where you scroll and set the view in " Default Thread Age Cut Off:"
I apologize in advance if I am not correct! :smile: