Expansion Joint Black Spots

[/Ejm25]

Hello all. We’ve been using the pool more with the warmer weather in South TX. We recently noticed black spots showing on the coping and pool expansion joint. Could this be mildew or mold? Does anybody know what I can do to clean it up? Appreciate any help or suggestions.

Pool was completed Oct 2022.

 

[Texas Splash]

Could this be mildew or mold?

That would be my first guess. I'm seeing more & more of stuff like that on our flagstone coping from all the recent rains. You might try a diluted mixture of bleach and water, let it sit for a minute or so, gently brush and rinse away from the pool.

 

[/Ejm25]

That would be my first guess. I'm seeing more & more of stuff like that on our flagstone coping from all the recent rains. You might try a diluted mixture of bleach and water, let it sit for a minute or so, gently brush and rinse away from the pool.

Thanks! I’ll give that a try. We just noticed it today and have it around most of the pool.

 

[Texas Splash]

As with any pool cleaning project, consider a small test area first. That way if it works to your satisfaction, great. Keep going. But if for some reason something doesn't seem to work or look right, you only tried a small test spot/area. No real harm done.

Good luck!

 

[/Ejm25]

As with any pool cleaning project, consider a small test area first. That way if it works to your satisfaction, great. Keep going. But if for some reason something doesn't seem to work or look right, you only tried a small test spot/area. No real harm done.

Good luck!

Thanks!