Ryan03 - New member

[Ryan03]

Hello everyone,
Ive recently emptied the Nature2 Duo Cartridge, as recommended by many here on TFP. Just added 2lbs of shock & 8lbs of CYA, as I didnt have any chlorine. I've been getting brown/black spots on the plaster surface, which I'm guessing is black algae. I scrubbed with a 3" chlorine tab and they have gone away previously, but found 4 more spots today while brushing the pool. So I'll be diving down to scrub those too. Not the greatest picture but its the only one I have on this computer

 

[pooldv]

Welcome to TFP! Nice pool!

Sounds like you are on the right track.

Have you read this?
Pool School - ABCs of Pool Water Chemistry
And this?
Pool School - Water Balance for SWGs

 

[Divin Dave]

Welcome Ryan!

Great looking pool!
Black Algae is the worst of the worst if thats what it is. Nothing short of scrubbing and scrubbing and scrubbing it and keeping your FC levels elevated will eradicate it.

Enjoy TFP!

 

[Texas Splash]

Welcome!

 

[BoDarville]

Welcome to TFP! BTW, here is an article on Black Algae that will help you diagnose and treat it.