Are you seeing white or grayish streaks on your concrete surfaces? Ever wonder what they are and what causes them? These streaks are caused by something called efflorescence.
Concrete efflorescence is a phenomenon that essentially leaves behind salt deposits on a surface after rain or snow. But actually any kind of moisture can cause concrete efflorescence.
That’s because all efflorescence needs to form is water-soluble salt content (which can be found in most water), some source of moisture and a surface on which to dissolve. This is why concrete efflorescence is so common. So common in fact that it can happen indoors too.