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I have white powdery stuff on my retaining block. What is it?

April 26, 2017block powdery retaining stuff white

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I have white powdery stuff on my retaining block. What is it?

1 Answer

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Posted

Efflorescence. This is a natural occurrence with concrete and clay products. It is a soluble salt that sometimes surfaces. A fluctuation in temperature or a source of moisture usually brings this out. It can be brushed or washed off with a cleaner. Most of the time it will go away with time.