Black Algae over waterfall feature

[TexasBR]

Friends, I am seeking a way to kill black algae that are embedded in the crevice between the white plastic part and the brick (picture below).
My concern is that a simple-minded brushing may drop a lot of the black stuff into the pool water.
Is there an effective way to kill this stuff, and better yet, to prevent a future outbreak?
Many Thanks!

 

[ajw22]

Brush the black stuff off and keep your FC at the high end of your FC/CYA range.

I doubt it is “black algae”. I think it is its cousin, black mold.

 

[TexasBR]

Brush the black stuff off and keep your FC at the high end of your FC/CYA range.

I doubt it is “black algae”. I think it is its cousin, black mildew.

Thank you ajw22. I am hesitant to brush it at this time, and hoping that there is an alternative method.
Appreciatively yours.

 

[JamesW]

Maybe bleach or Wet and Forget.

 

[JamesW]

There are also some cheap foamy algaecides that you can use to spray on the mold to see if it will kill it.

Hydrogen peroxide might work. 3% in a spray bottle.

Wet and Forget is 68424-85-1 Alkyldimethylbenzyl ammonium chloride 1.65 %

https://www.wetandforget.com/downloads/SDS_USA_WetForget_OutdoorReadytoUse_05182022.pdf

Alkyl dimethyl benzyl ammonium chloride (C12-18) 68391-01-5 9.96%Diakyl methyl benzyl ammonium chloride (C12-18) 73049-75-9 0.04%Isopropanol 7732-18-5 2.0%

Quaternary ammonium compounds, benzyl-C8-18-alkyldimethyl, chlorides 63449-41-2 10-30 %

 

[JamesW]

Quaternary ammonium compounds, alkylbenzyldimethyl, chlorides 8001-54-5 >50 % (w/w)

https://s3-ap-southeast-2.amazonaws.com/astralpools-au-2/Products/Pool_Performance/MSDS/X0651800_REVA_AstralPool_Pool_Algaecide-SDS.pdf

 

[JamesW]

https://bio-dex.com/wp-content/uploads/2022/04/SDS-BIO-DEX-Skill-It-1.25.2022.pdf

Quaternary ammoniumcompounds, benzyl-C12-C16alkyldimethyl, chlorides

https://bio-dex.com/skill-it/

 

[JamesW]

Note: Only use one product and do not use a second product after using the first product.

It will probably take multiple applications to kill it.

Note that products might alter the color of materials exposed so try a test spot to see if color is affected.

 

[JamesW]

My concern is that a simple-minded brushing may drop a lot of the black stuff into the pool water.

You can brush it or Spray it down with water and maybe have the pool at SLAM level before the mold gets in the water.

 

[JamesW]

The efflorescence indicates a probable leak in the plumbing.

 

[JamesW]

Efflorescence - Further Reading

www.troublefreepool.com

 

[TexasBR]

The efflorescence indicates a probable leak in the plumbing.

View attachment 608911

I had always wondered about the reason for the white stuff. Thank you. I will investigate further.

 

[TexasBR]

Maybe bleach or Wet and Forget.

View attachment 608905

Thank you. I was of the understanding that bleach does not work on black algae since they secrete some protective coating (?).
Hydrogen peroxide is worth a try. It is cheap and plentiful.

 

[JamesW]

Straight 6% bleach will work, but it might take several applications.

 

[TexasBR]

Straight 6% bleach will work, but it might take several applications.

I will give it a try!