What is the white deposit that sometimes appears on pavers and wall blocks?
The white deposit is probably efflorescence which appears naturally on any concrete or masonry product. Surface moisture acts as a wick drawing out these naturally occurring salts. Efflorescence is not indicative of a flawed product and will dissipate over time. The best course of action is to allow weathering to remove the efflorescence. It can also be removed with specifically designed chemicals that treat the surface salts. However, these do not stop the process and the efflorescence can reappear. If using chemicals, please carefully follow the instructions because they are caustic and can ruin the stones.
