Black Algae

[Toknarok]

In front of my house in Southern Buriram I have laid down a large concrete pad. I need this pad because I'm wheelchair bound. Unfortunately almost the whole pad has become infested with a black/grey algae. When rthe concrete is dry it's no problem but when it's wet it's very slippery and dangerous.

How can I eradicate this.Chemical treatment or a high pressure water hose? Any advice appreciated.

[stoneyboy]

High pressure wash and apply a couple of coats of sealer maybe.

Is the concrete shaded by trees or anything that may be contributing to the issue.

[farmerjo]

Need to pressure wash and apply sealer,i think lanko751 came up in another thread(similar to bondcrete)

I have the same problem as no sealer was used and pressure wash 4x a year.

[weegee]

Throw Chlorine granuals (very liberal) over the concrete, leave it 10 minutes and pressure wash it off..NOTE(Rub the chlorine in with a broom)....lasts about 6 months.

If you want to go further, seal it as above, but make sure it's completely dry first.....

Edited August 24, 2015 by weegee