Black growth on grotto

[texasgal78]

What is this black growth and how do I get it off? I tried scrubbing it, but it's not doing much.

Sent from my SM-G930T using Tapatalk

 

[Texas Splash]

Have you tried pouring some bleach directly on an area? Curious to know if there's any difference.

 

[texasgal78]

That's what I was thinking about doing or at least some diluted bleach, but I didn't know what that could do to the rock.

Sent from my SM-G930T using Tapatalk

 

[Natalieewall]

This isn't going to be too helpful, but I was at a neighbors pool recently and they had this same black stuff on their rocks as well. I had my daughters hat in my back pocket and sat on one and the hat now has black all over it and nothing I've tried will remove it from the hat. So whatever it is sure is stubborn!!!


Sent from my iPhone using Tapatalk

 

[texasgal78]

It is very stubborn!! I'm worried about it spreading everywhere and my whole grotto looking nasty!

Sent from my SM-G930T using Tapatalk

 

[texasgal78]

A little bleach and water and LOTS of hard scrubbing is helping.

Sent from my SM-G930T using Tapatalk

 

[Texas Splash]

Looks much better.

 

[texasgal78]

Thanks! I can't even imagine how long it's going to take to to get all of it...ugh! I hope it doesn't just come right back.


Sent from my SM-G930T using Tapatalk