How to get rid of stubborn algae on concrete?

[JakeOfish]

hi there,

have been experiencing stubborn algae growth on the walls of my outdoor pond and water features. cannot seem to scrub them away 100%. those in the uneven areas of the cement hard to remove no matter how hard i try. any chemicals i can use to get rid of it.

thank u guys

 

[Bartek]

no,just leave it as it is.
nearly every chemicals are bad for fish's and some of them can even kill them.

 

[rook45]

Use a power washer.

 

[skrefany]

Use a power washer.

Pressure washer wouldn't leave any chemicals behind that could contaminate your pond.

 

[hbluehunter]

X3 pressure washer, like said above just don't use any chemicals !!!

 

[Yanbbrox]

Diy section, search algae scrubber,

http://www.monsterfishkeepers.com/forums/showthread.php?t=180385

 

[invisyblegypsey]

hi there,

have been experiencing stubborn algae growth on the walls of my outdoor pond and water features. cannot seem to scrub them away 100%. those in the uneven areas of the cement hard to remove no matter how hard i try. any chemicals i can use to get rid of it.

thank u guys

mite have a look at this stuff straw extract.
heres a littel info. http://www.drsfostersmith.com/produc...m?pcatid=12266