Black Algae! Help!

[cm_w]

Hi.

New to this forum and hope someone can help.

Pool is roughly 10m x 5m. 2m deep at the deep end and concrete painted.

We didn't manage to get the leaves out before we closed it last year and, of course, when I opened it this year it was green pea soup. After about 3 weeks the water finally cleared, but we were left with black algae on the bottom and it's spreading!

I don't want to have to empty the pool (water is metered).

I'm thinking bleach bleach bleach and lots of Chlor choc. Am I going in the right direction?

Photo attached.

TIA
Frustrated Pool Owner in SW France :-D

 

[duraleigh]

That's not black algae but rather organic staining from leaving the debris in the pool.

I'm thinking bleach bleach bleach and lots of Chlor choc. Am I going in the right direction?

That sounds very correct. Bleach and Clorox are the same thing.

 

[cm_w]

That's not black algae but rather organic staining from leaving the debris in the pool.

Really? Well that's a relief!

That sounds very correct Bleach and Clorox are the same thing.

Sorry - what I meant was Bleach and Shock. Chlor Choc is the French translation.

 

[duraleigh]

Removing that stain will not be overnight. I would suggest simply elevating your chlorine level to about twice normal and keeping it there until the stains go away. Brushing often will likely help.

 

[cm_w]

Removing that stain will not be overnight. I would suggest simply elevating your chlorine level to about twice normal and keeping it there until the stains go away. Brushing often will likely help.

And just under 2 weeks later!

Thanks for your help!

 

[Casey]

Nice! This year, close it right and you won't have that nasty pool to deal with next year!