Efflorescence vs Mold
Efflorescence can look like a white mold. Moisture and dampness moving through basement concrete can cause spalling and degradation of the concrete. The signs of efflorescence and the white deposits are not mold. But the evidence of the efflorescence does indicate the presence of moisture.
Efflorescence is a crystalline deposit on surfaces of masonry, stucco or concrete. It is whitish in appearance, and is sometimes referred to as "whiskers". Efflorescence has been a problem for many years, and is a topic of much controversy. The formation of these salt deposits are not mysteries. Efflorescence is the white chalky powder that you might find on the surface of a concrete or brick wall. It can be a cosmetic issue, or it can be an indication of moisture intrusion that could lead to major structural and indoor air quality issues.