What is the white powdery substance that sometimes appears on pavers?
The white powder is probably efflorescence, a reaction that occurs normally in all concrete products. Surface moisture draws out the salts in the concrete. Efflorescence is not a symptom of a flawed product and will disappear over time. The best way to deal with it is to allow weathering to remove it from the pavers. Or you can remove it with specially designed chemicals that treat the surface salts. However, these cleaners do not stop the process and it is likely that the salts will reappear. If you decide to use the chemicals, please be sure to follow the instructions closely so you don’t damage your pavers. For appropriate cleaners, please contact the Mutual Materials branch nearest you.
