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Efflorescence is the stubborn problem that has caused confusion and trouble for masonry since the first time it appeared thousands of years ago on ancient masonry walls. Efflorescence is normally the white, powdery scum that can appear on masonry walls after construction but can also be brown green or yellow, depending on the type of salts.
Efflorescence happens. It is part of building new things. It eventually goes away on its own, but this process can take years, even decades. When possible, it's best to just let the problem diminish on its own. Stopping water from entering masonry is the best way to make efflorescence stop. But it is not as easy as one might think. Water can enter masonry and travel up, down and sideways! Rising Damp. You can actually get efflorescence on masonry walls caused by moisture in the soil that wicks up a wall. In Europe this is called the rising damp. It's almost impossible to cure this defect.