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What is causing this

DGJsaver
Posts: 2,777 Forumite
http://tinypic.com/view.php?pic=s274sg&s=8#.VAQlcfldWXYand how do i clean it off ,simple scrubbing brush and fairly liquid ?
We are assuming water ingress but the pointing between the slabs looks OK..
We are assuming water ingress but the pointing between the slabs looks OK..
0
Comments
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Are we looking at the efflorescence below the lower step?
If so it's usually caused by salts in the bricks.
<clicky>0 -
societys_child wrote: »Are we looking at the efflorescence below the lower step?
If so it's usually caused by salts in the bricks.
<clicky>
Sorry . no , i am looking at the green `algae` on the top step mortar0 -
Ah, ok, cheap bleach should do it, let it dry naturally - don't wash it off (might need doing a couple of times)0
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