After it rains these white crystals appear on my retaining wall but only below the part where there is dirt on the other side of the wall. I assume they are caused by water seeping through the concrete as it takes a few days after it has stopped raining for them to appear. Part of the wall is covered (and so it does not get rained on) so i know it is not a surface problem caused by the rain itself. Is this a symptom of a problem I should be worried about?

Here is a picture: <a href=“http://imgur.com/hup28.jpg” title=“Hosted by imgur.com”>http://imgur.com/hup28.jpg</a>

[URL=http://imgur.com/hup28.jpg][IMG]http://imgur.com/hup28.jpg[/IMG][/URL]

Topics: water, gardening, home repair, rain, damage, structural, concrete wall